Coasting mode

[Thomby]

Anybody notice inconsistent activation of Coasting mode? Mine used to coast relatively quickly when I got off the pedals, but lately it doesn't seem to kick on. I usually drive in Smart mode and made sure it was green (Eco Smart), also tried Eco mode, and Custom with the coasting feature turned on.

No gas or brake, above 35mph (I've let off at 50 or 60 and cruised all the way down to 35 without it activating), no 5% grade, no cruise control...what am I missing?

 

[Stanger21]

Anybody notice inconsistent activation of Coasting mode? Mine used to coast relatively quickly when I got off the pedals, but lately it doesn't seem to kick on. I usually drive in Smart mode and made sure it was green (Eco Smart), also tried Eco mode, and Custom with the coasting feature turned on.

No gas or brake, above 35mph (I've let off at 50 or 60 and cruised all the way down to 35 without it activating), no 5% grade, no cruise control...what am I missing?

I've noticed the exact same thing with mine, it just seems to work when it feels like it.

One thing I have noticed is that the auto start/stop works just as inconsistently but does seems to correspond to when the coasting feature works, usually on or after longer drives.

I mainly do short trips so I wonder if it's something to do with the battery's state of charge and the car is staying in gear to keep the revs up in order to produce more charge for the battery.

 

[bfglitch]

Anybody notice inconsistent activation of Coasting mode? Mine used to coast relatively quickly when I got off the pedals, but lately it doesn't seem to kick on. I usually drive in Smart mode and made sure it was green (Eco Smart), also tried Eco mode, and Custom with the coasting feature turned on.

No gas or brake, above 35mph (I've let off at 50 or 60 and cruised all the way down to 35 without it activating), no 5% grade, no cruise control...what am I missing?

I've noticed the exact same thing with mine, it just seems to work when it feels like it.

One thing I have noticed is that the auto start/stop works just as inconsistently but does seems to correspond to when the coasting feature works, usually on or after longer drives.

I mainly do short trips so I wonder if it's something to do with the battery's state of charge and the car is staying in gear to keep the revs up in order to produce more charge for the battery.

Your battery probably isn't charged enough to enable coasting. When the battery is too low it effects both coasting and ISG.

It's all in the manual.

 

[SanDiegoBlue]

Agree. Battery. Also smart engages coast differently than eco. (Will turn off if a car close in front)

 

[D.J.]

Your battery probably isn't charged enough to enable coasting. When the battery is too low it effects both coasting and ISG (Idle Stop and Go).

It's all in the manual.

I don't think that battery state of charge is a condition for eco-coasting.





When certain conditions are met, the engine is automatically decoupled from the transmission while the shift lever is remained in D (Drive). In this ECO Coasting mode, the engine stays at idling speed to reduce fuel consumption and increase coasting distance. The engine is automatically coupled back again when ECO Coasting deactivation conditions are met. Please refer to ECO Coasting activation and deactivation conditions.

The Eco-Coasting system setting​

The Eco-Coasting system activates if select the Eco-Coasting system from AVN: "Setting Vehicle Coasting" (Please refer to AVN manual for more details.) When the Eco-Coasting system is activated, the message "Coasting" appears at the top center of the cluster.

CAUTION

• If the accelerator pedal is pressed quickly for accelerating with the Eco-Coasting system in operation, acceleration may occur after the engagement of the clutch inside the transmission. In turn, the driver may continue to feel acceleration even after the system is turned off.
• Driving with the Eco-Coasting system off may be required in some cases since the engine brake is not applied while the Eco-Coasting system is in operation.
• Operation the AVN screen to activate or deactivate Eco- Coasting system while driving may be dangerous as the driver's attention is dispersed.

Eco-Coasting operation conditions​

The Eco-Coasting system is activated when the accelerator pedal is depressed and released under the following conditions.

• When the driving mode is ECO mode.
• When driver acceleration is SMART ECO in SMART mode.
• When the shift lever is in the D (Drive) position.
• When Cruise Control/Smart Cruise Control button is OFF.
• The accelerator or brake pedal is not depressed.
• When the vehicle speed is within the range of 55 km/h (34 mph) to 160 km/h (100 mph).
• If the road gradient is within the range of -5% to +5%.
• In SMART mode, if the distance between the vehicle ahead and the relative speed is within a certain range (if the Smart Cruise system is equipped)

❈ If the front radar for smart cruise system cannot operate normally, the inter-vehicle distance and relative speed condition are automatically ignored.

❈ The Eco-Coasting system works after the engine is turned on, the transmission is warmed up, and the engine sensor selfdiagnosis is completed after starting.

❈ Depending on the driving situation, Eco-Coasting operation may be temporarily delayed even if the above conditions are met.

The Eco-Coasting system release conditions​

The Eco-Coasting system will be automatically released when the following conditions are met.

• When the drive mode is COMFORT or SPORT mode.
• In SMART mode, when driver acceleration is SMART COMFORT or SMART SPORT.
• When using the paddle shift of the steering wheel.
• When the Cruise Control/Smart Cruise Control button is on (The
  
  /CRUISE indicator is on.).
• When pressing the accelerator pedal or brake pedal.
• When the vehicle speed is outside the rage of 55 km/h (34 mph) to 160 km/h (100 mph).
• Road inclination is less than -5% or exceeds +5%.
• In SMART mode, if the headway distance to the vehicle ahead is too close of the relative speed changes momentarily (if the smart cruise control system is equipped)
• If lane change is predicated in SMART mode (LKA warning by turn signal lamp operation or steering wheel).

❈ It is recommended to turn off the Eco-Coasting system in the driving condition where frequent acceleration or deceleration is repeated.

Change the drive mode to COMFORT or SPORT mode, or disable Eco-Coasting mode on the AVN screen.

 

[SanDiegoBlue]

Mine takes 5-7 miles of driving to begin. I have to figure this is battery after it gets drawn down upon startup. Not too many other variables.

"❈ Depending on the driving situation, Eco-Coasting operation may be temporarily delayed even if the above conditions are met."

 

[bfglitch]

Honestly I was almost sure it was in the manual but yeah you're right, I don't see it.

Even with that said, I'm almost positive battery condition is part of it. Only reason I say that is because I use my home automation system to monitor my battery percentage (Home Assistant with custom Kia Uvo/Hyundai Bluelink add on). Guaranteed if my battery is 70% (possibly even 80%) or less, coasting mode will not activate even after everything is completely warmed up and all other conditions are met. There are times I can go for hour long trips (especially when the battery is low) where coasting won't activate, but sure enough once I notice that my battery is around 80%, coasting mode will start working again, along with ISG.

The whole reason I even started monitoring my battery levels using the add on was specifically because ISG and Coasting would randomly stop working for days/weeks. After adding it I've noticed randomly my battery would go from 80-90% and drop down to 45-50% sometimes even overnight and I wouldn't even get a discharge warning. Still have no clue why and it doesn't seem at all tied to sitting for days or multiple short trips. It's just very random.

 

[D.J.]

Honestly I was almost sure it was in the manual but yeah you're right, I don't see it.

Even with that said, I'm almost positive battery condition is part of it. Only reason I say that is because I use my home automation system to monitor my battery percentage (Home Assistant with custom Kia Uvo/Hyundai Bluelink add on). Guaranteed if my battery is 70% (possibly even 80%) or less, coasting mode will not activate even after everything is completely warmed up and all other conditions are met. There are times I can go for hour long trips (especially when the battery is low) where coasting won't activate, but sure enough once I notice that my battery is around 80%, coasting mode will start working again, along with ISG (Idle Stop and Go).

The whole reason I even started monitoring my battery levels using the add on was specifically because ISG (Idle Stop and Go) and Coasting would randomly stop working for days/weeks. After adding it I've noticed randomly my battery would go from 80-90% and drop down to 45-50% sometimes even overnight and I wouldn't even get a discharge warning. Still have no clue why and it doesn't seem at all tied to sitting for days or multiple short trips. It's just very random.

This blue link stuff sounds awesome. I am betting it is not avail for Canadians

For some reason Kia connect and UVO are very different Canada VS USA

 

[bfglitch]

This blue link stuff sounds awesome. I am betting it is not avail for Canadians

For some reason Kia connect and UVO are very different Canada VS USA

I'm not totally sure what the difference is between Uvo and Kia Connect. I know at least in the US that it used to be Uvo and they renamed it Kia Connect but also know that Canada and US apps are very different. The guy who wrote the addon for Home Assistant wrote it for international use and constantly makes changes for different parts of the world. Below is just a small bit of the info that it provides. It also allows you to remotely start the car (don't have that option here as it's easier to use the app on the phone). It does have its issues though. Every now and then some of the items suddenly go unavailable. I blame it on the Kia Connect service occasionally not passing the data over the API.

 

[D.J.]

I'm not totally sure what the difference is between Uvo and Kia Connect. I know at least in the US that it used to be Uvo and they renamed it Kia Connect but also know that Canada and US apps are very different. The guy who wrote the addon for Home Assistant wrote it for international use and constantly makes changes for different parts of the world. Below is just a small bit of the info that it provides. It also allows you to remotely start the car (don't have that option here as it's easier to use the app on the phone). It does have its issues though. Every now and then some of the items suddenly go unavailable. I blame it on the Kia Connect service occasionally not passing the data over the API.
View attachment 83561

That is pretty sweet.

I do with the Kia connect app would tell me current battery voltage at least, but it doesn't even do that.

 

[bfglitch]

That is pretty sweet.

I do with the Kia connect app would tell me current battery voltage at least, but it doesn't even do that.

That's the amusing thing. I get much more information through this Home Assistant add on than I do the app. Also, just remembered the app in the US is Kia Access, not Kia Connect anymore. I can't keep track!

 

[Thomby]

Ok it makes sense that coasting would deactivate if the battery needed a charge. What doesn't make sense to me is it being so sensitive that the battery has to be absolutely full, or that day to day startup and driving would keep it from activating.

Same deal for those 70-80% charge states...on a properly running car, with a battery that isn't on its last legs, how would it even get that low from normal use? Is the Stinger letting the battery discharge that much before engaging the alternator in some kind of charge/battery life optimization?

 

[bfglitch]

Unfortunately I'm not really sure what the cutoff is for the battery state. I haven't really checked that closely. All I can say is that I have noticed that when my battery is low both ISG and Coasting don't happen. Can't really say exactly at what percent though.

Honestly I wish I could say why the battery suddenly drains the way it does. As you saw, mine is currently at 70%. Through the weekend it dropped down to about 50% for no known reason. It was up around 80%, then next time I drove it, it was down to 50%. Also it seems once it hits around 45-50% whatever causes the drain stops as it never really drops any lower. Going from 50% to 70% were actually a lot of relatively short trips in town so "short trips" don't necessarily cause battery drain. I do recall a thread on here somewhere where someone noticed something regarding charging happening more during coasting or breaking but not while accelerating. That would lead me to believe open highway trips actually have less effect on charge than stop and go traffic which is something I've noticed. Recently made a couple 4+ hour trips in mostly wide open traffic and my battery really didn't charge much on the trip.

I know there's a ton of electronics in this thing. It's quite possible something winds up "staying awake" while sitting causing the battery drain. Unfortunately it's not consistent. Like I've mentioned some days I can go driving back to back and the battery is fine. Other days I can drive one day and the battery is at 80+% and the very next day it suddenly is down to 40-50%. Also the add on I'm using that ties into Kia Connect/Uvo/Access isn't "real time". It only really updates after a drive.

 

[Volfy]

I don't ever bother with engine coasting. I never turn it on and yet have no problem getting 40+mpg at times on my morning commute. How you drive has the single most influence on fuel economy.

Frankly, I find coasting annoying and quite often counter-productive to hypermiling - burning fuel at idle and forcing me to engage the brakes.

 

[D.J.]

I don't ever bother with engine coasting. I never turn it on and yet have no problem getting 40+mpg at times on my morning commute. How you drive has the single most influence on fuel economy.

Frankly, I find coasting annoying and quite often counter-productive to hypermiling - burning fuel at idle and forcing me to engage the brakes.

Out of the 165 Kia Stingers tracked on fuelly.com (3.1 million miles of data) - your 40 MPG seems astronomically high. You must hypermile the shit out of that bad boy.




Note: the data in the screenshot is all engines, not just the 2.5T you have.

165 Kia Stingers have provided 3.1 million miles of real world fuel economy & MPG data.

 

[Volfy]

LOL... hypermiling is a sport to me. Sometimes, I find it almost as much fun as tracking. I don't mess up traffic like some Prius drivers do though. It's all about momentum management and harmonizing with the prevailing traffic flow... to use as little brake and gas pedal as possible. And it doesn't have to be boring either. Maintaining speed through corners means some pretty high G turns, and taking a racing line to be as efficient as possible.

When the conditions are right, it's actually quite easy to coax high mpg out of both 2.5T and 2.0T. I was surprised that, under very similar commute route, the 2.5T gets higher hwy mpg than the 2.0T. However, when pouring on the coals and driven hard, the larger engine does drinks heavier.


When ambient drops below 65F though, cold-air fuel enrichment make getting close to 40mpg tough. Below 50-55F... like this morning, darn near impossible.

 

[D.J.]

LOL... hypermiling is a sport to me. Sometimes, I find it almost as much fun as tracking. I don't mess up traffic like some Prius drivers do though. It's all about momentum management and harmonizing with the prevailing traffic flow... to use as little brake and gas pedal as possible. And it doesn't have to be boring either. Maintaining speed through corners means some pretty high G turns, and taking a racing line to be as efficient as possible.

When the conditions are right, it's actually quite easy to coax high mpg out of both 2.5T and 2.0T. I was surprised that, under very similar commute route, the 2.5T gets higher hwy mpg than the 2.0T. However, when pouring on the coals and driven hard, the larger engine does drinks heavier.
View attachment 83588 View attachment 83589

When ambient drops below 65F though, cold-air fuel enrichment make getting close to 40mpg tough. Below 50-55F... like this morning, darn near impossible.

would love to see your fuelly data (if it existed)

this is mine, I clearly do not hypermile

Stinger (Kia Stinger) | Fuelly

 

[Volfy]

would love to see your fuelly data (if it existed)

this is mine, I clearly do not hypermile

Stinger (Kia Stinger) | Fuelly

I don't do the fuelly thing. I regularly switch between two 4wheelers and two motorcycles, and I'm too lazy to keep track of them all.

FWIW, I do calculate actual mpg at every fill-up. The 2.5T so far, averages around 28-30mpg, depending on hwy/city mix and how bad afternoon rush hour traffic were that tankful. That will drop, no doubt, going into the cooler months

 

[D.J.]

Unfortunately I'm not really sure what the cutoff is for the battery state. I haven't really checked that closely. All I can say is that I have noticed that when my battery is low both ISG (Idle Stop and Go) and Coasting don't happen. Can't really say exactly at what percent though.

Honestly I wish I could say why the battery suddenly drains the way it does. As you saw, mine is currently at 70%. Through the weekend it dropped down to about 50% for no known reason. It was up around 80%, then next time I drove it, it was down to 50%. Also it seems once it hits around 45-50% whatever causes the drain stops as it never really drops any lower. Going from 50% to 70% were actually a lot of relatively short trips in town so "short trips" don't necessarily cause battery drain. I do recall a thread on here somewhere where someone noticed something regarding charging happening more during coasting or breaking but not while accelerating. That would lead me to believe open highway trips actually have less effect on charge than stop and go traffic which is something I've noticed. Recently made a couple 4+ hour trips in mostly wide open traffic and my battery really didn't charge much on the trip.

I know there's a ton of electronics in this thing. It's quite possible something winds up "staying awake" while sitting causing the battery drain. Unfortunately it's not consistent. Like I've mentioned some days I can go driving back to back and the battery is fine. Other days I can drive one day and the battery is at 80+% and the very next day it suddenly is down to 40-50%. Also the add on I'm using that ties into Kia Connect/Uvo/Access isn't "real time". It only really updates after a drive.

Here's my guess (just a guess)

Kia/UVO is only providing DC voltage to home assistant - and then home assistant is using a standard lookup table to convert voltage to state of charge - rightfully or wrongfully.

The measurement/voltage reading isn't always taken at the same time - you mentioned it is not real time. Immediately after shutting off your engine, battery voltage will be higher than a few hours later, and IF Kia is providing voltage to Home assistant - this would somewhat account for the variations in the readings of 50% or 80% seemingly randomly.

Totally just a guess - as a doubt that Kia is providing the SoC% (state of charge) - but likely Kia is providing the DC Voltage.

Also - it is possible this Home assistant is showing percentage, and not voltage, as it is probably a forward looking feature designed to be used with future electric vehicles - where battery level (percentage) is more akin to range. In NORMAL driving, typical drivers don't need to know their AGM battery current SoC%.


Everything I posted in this post is my hypothesis

 

[bfglitch]

Kia/UVO is only providing DC voltage to home assistant - and then home assistant is using a standard lookup table to convert voltage to state of charge - rightfully or wrongfully.

Actually, the addon is receiving the data as a percent. I'll post the raw data it receives from the API below.

The measurement/voltage reading isn't always taken at the same time - you mentioned it is not real time. Immediately after shutting off your engine, battery voltage will be higher than a few hours later, and IF Kia is providing voltage to Home assistant - this would somewhat account for the variations in the readings of 50% or 80% seemingly randomly.

This kind of makes sense. Although it still doesn't entirely explain why I can also experience no discharge 24+ hours later. Sometimes days later. Then sometimes 24 hours later I get the extreme discharge.

Here's the raw data from the API (some data removed for obvious reasons). Apologies for how long it is.
Vehicle data
vinKey: REMOVED
vehicleConfig:
vehicleDetail:
vehicle:
vin: REMOVED
trim:
modelYear: '2022'
salesModelCode: H6382
optionGroupCode: '010'
modelName: STINGER
factoryCode: J5
projectCode: CKPE
trimName: GT1
driveType: '1'
transmissionType: '1'
ivrCategory: '3'
btSeriesCode: H
telematics: 1
mileage: '15340'
mileageSyncDate: '20231206015449'
exteriorColor: MICRO BLUE
exteriorColorCode: M6B
fuelType: 1
invDealerCode: VA065
testVehicle: '0'
supportedApps:
- appType: '0'
- appType: '5'
appImage:
imageName: uvo-app.png
imagePath: /content/dam/kia/us/owners/image/common/app/access/
imageType: '2'
imageSize:
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width: '100'
uom: 0
activationType: 2
images:
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imagePath: /content/dam/kia/us/owners/image/vehicle-app/2022/stinger/gt1/
imageType: '1'
imageSize:
length: '100'
width: '100'
uom: 0
device:
launchType: '0'
swVersion: CKPE.USA.S5W_M.V009.001.221011
telematics:
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platform: '1'
tmsCenter: '1'
billing: true
genType: '2'
versionNum: GASOLINE
headUnitType: '0'
hdRadio: X40HA
ampType: NA
headUnitName: avn5w
bluetoothRef: '20'
headUnitDesc: AVN5.0W
maintenance:
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lastVehicleInfo:
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preferredDealer: VA069
licensePlate: ''
psi: ''
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enrollment:
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freeServiceDate:
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vehicleStatusRpt:
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reportDate:
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vehicleStatus:
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defrost: false
airTemp:
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unit: 1
heatingAccessory:
steeringWheel: 0
sideMirror: 0
rearWindow: 0
heatVentSeat:
driverSeat:
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passengerSeat:
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rearLeftSeat:
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heatVentLevel: 1
rearRightSeat:
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heatVentLevel: 1
engine: false
doorLock: true
doorStatus:
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frontRight: 0
backLeft: 0
backRight: 0
trunk: 0
hood: 0
lowFuelLight: false
ign3: false
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distanceToEmpty:
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tirePressure:
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dateTime:
utc: '20231206172141'
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syncDate:
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deliveryMode: 1
sleepMode: false
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stopLamp:
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smartKeyBatteryWarning: false
washerFluidStatus: false
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engineRuntime: {}
remoteControlAvailable: 1
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coord:
lat: REMOVED
lon: REMOVED
alt: 90
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