Gas. 87, 91, 93 Octane?

[kit385]

I with mistermac.
I follow the manual to all my cars. If it required 91 or higher I will only put in 91 or higher. Oil company always mislead customers with they say their "premium" gas is better. Using lower octane to car that design for it won't cost more pollution and knock. I saw a test that using 91 octane to a car that not required 91 cost more pollution. If yes government should ban 87 and 89. Now day all top tier gas company will have same amount of cleaning agents to all octane gas. As for recommended and required, my manual do say the same like nismopdb, but it only for optimal performance they recommended 91 or higher, not required. And it say maximum performance on unleaded fuel and again not premium unleaded fuel. It didn't mention anything that say using octane rating lower than 91 will cost damage (my sti manual had mention). Only when the engine is knocking and need to try upgrade to higher octane. I used to drive a Camry v6 that recommend premium But I fill 87 for 10+ years never have a problem. So many people still mistaking higher octane number mean better fuel.

 

[me&stinger]

I'm about to fill up my car for the first time.

 

[rocket23]

I'm about to fill up my car for the first time.

ya get what ya pay for......truer words were never spoken.

 

[gheller]

What about Ethanol-free? I am surprised it is rarely brought up in these types of conversations. My bro-in-law (who builds cars full time) and my mechanic say that it is the best for cars and will increase the engine's longevity.

 

[davebo]

What about Ethanol-free? I am surprised it is rarely brought up in these types of conversations. My bro-in-law (who builds cars full time) and my mechanic say that it is the best for cars and will increase the engine's longevity.

That's more of a concern for cars manufactured before the mid-2000's where the fuel pumps aren't designed for high ethanol content in gasoline. Definitely not something I worry about on the Stinger. That being said, E10 has about 2-3% less energy potential in it than gas with no ethanol, so you will get a little better mileage with pure gas. Good luck finding no-ethanol gasoline for the same price as E10 in your area though. If you can, and you know it's treated with the same detergents that the top tier gas brands use, then go for it.

 

[me&stinger]

ya get what ya pay for......truer words were never spoken.

That's what I'm getting after reading this thread.

I also believe in the "crap in, crap out". I'll feed my car well so it will be happy and healthy.

 

[rocket23]

E-free gas can't be found anywhere near here...except shipped in a separate container sold on a shelf....then of course ya have to find the right shelf.

 

[me&stinger]

I'm about to fill up my car for the first time.

I went with 92.

 

[CVD]

Years ago when I was big into testing fuels and data logging results I found ethanol-free fuel to be inferior at the same octane. Some people will claim ethanol-free fuels are superior but not necessarily. Ethanol is hard on rubber and aluminum - but all modern fuel systems are built to withstand this. Fuel economy is lower with ethanol fuel, but this is a total wash when price is accounted for. The big one for me though is that ethanol has superior knock resistance even at the same octane. I wouldn’t put ethanol-free fuel in anything but a very nice pre-1990 classic car.

 

[Moses]

Years ago when I was big into testing fuels and data logging results I found ethanol-free fuel to be inferior at the same octane. Some people will claim ethanol-free fuels are superior but not necessarily. Ethanol is hard on rubber and aluminum - but all modern fuel systems are built to withstand this. Fuel economy is lower with ethanol fuel, but this is a total wash when price is accounted for. The big one for me though is that ethanol has superior knock resistance even at the same octane. I wouldn’t put ethanol-free fuel in anything but a very nice pre-1990 classic car.

This. This right here. Ethanol burns cooler than E0 gas. Because of that you get slightly less energy out of your burn but more protection. My WRX was tuned to run E10 91 specifically because it is a more stable fuel and provides better protection. Now, if you were going to leave your car sitting for months, I don't recommend having ethanol gas in it. Or if you are one of those people that a tank of gas lasts you a month or two, probably stick with E0 gas.

 

[rocket23]

or throw a good ethanol treatment in it once a month...............to treat the harmful effect of ethanol.

 

[Operation.stinger]

Picked up a 3.3 rwd today. Dealership is insisting it runs on 87. I'm used to 91 coming from a turbo 4cyl.

If you're using 91, please explain why

Really?? I’ve only seen it say 91 minimum.

 

[stoopid]

93 isn't available everywhere as the highest octane. Many cities at higher elevations have 91 as the highest grade. Las Vegas has 91 everywhere so that's what the Stinger gets. This is also why the owner's manual says 91, but if you have higher the car would happily accept it in the tank.

 

[Operation.stinger]

93 isn't available everywhere as the highest octane. Many cities at higher elevations have 91 as the highest grade. Las Vegas has 91 everywhere so that's what the Stinger gets.

Yeah I know I was just talking about the manual. I know 91 is usually pretty much everywhere and emissions and all that crap from other countries