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Hi everyone

JSolo

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If not adjustable, can be compensated with different size tires. Mine is off 1-2 mph too.. Reads high compared to several gps's.

Please use a more meaningful title in the future.
 
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MerlintheMad

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The speedometer is more accurate at surface road speeds. Once up to freeway speeds the c. 2 MPH discrepancy shows up. But that didn't stop the cop from saying last Sunday that my 79 MPH cruise control setting was 79, pushing 80: so, I don't know; you would think that a CC of 79, if c. 2 MPH higher than actual, would show up as 77 pushing 78?
 

JSolo

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^^if c. ???

What does your gps show when the car's speedo indicates 79? I tested with 2 different garmins to get the 2 mph speed difference. I should try my phone too, it's relatively modern (released Q4 2019) so gps should be reasonably accurate.

If you deviate from stock tire sizes and/or different tires have different diameters even for the same tire size.
 
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D.J.

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Does anyone know if my 20185 Kia Stinger Gt2 speedometer can be adjusted it is off 2 MPH, dealer is stating no?
Is it off by 2 MPH @80MPH (2.5% error)
Or off by 2 MPH @ 10MPH (20% error)


The USA has a 10% error limit for commercial vehicles, not sure about non -commercial

United States​

Federal standards in the United States allow a maximum 5 mph error at a speed of 50 mph on speedometer readings for commercial vehicles. Aftermarket modifications, such as different tire and wheel sizes or different differential gearing, can cause speedometer inaccuracy.
 

MerlintheMad

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^^if c. ???

What does your gps show when the car's speedo indicates 79? I tested with 2 different garmins to get the 2 mph speed difference. I should try my phone too, it's relatively modern (released Q4 2019) so gps should be reasonably accurate.

If you deviate from stock tire sizes and/or different tires have different diameters even for the same tire size.
"c." means about or approximately.

I've never messed with GPS. Luddite, or borderline, here. Hah. :p

Currently on Nitto Motivo UHP A/S, and I have no idea if there is variance in OD with the Michelin PS4S (which I assume is identical OD with the PS4 that was the OE tire). Maybe the cop's speedometer is spot on and my car doesn't have a 2 MPH discrepancy.
 
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