i have a stock 08 cobalt ss/tc

Ive always gotten the premium fuel for my car (91-93 octane) but i wanted to know what

possible damage could i do if i got regular all the time from now on???

i do know the car is tuned to run on 91 octane and the computer can adapt to 93

bump

 

well, you're gas mileage would be worse, your performance would be worse, and you won't get the full potential out of the car. it will cost more in gas than using premium since you'll be getting worse mileage.

honestly if you can't afford the extra 2 dollars/tank for premium, then you shouldn't have bought a new car. stop being so cheap.

 

wasnt being cheap i was just wondering i knew that it took 91 octane and i put that into consideration before i bought nor do i plan on using the lesser octane

i was wondering if anything mechanical could go bad like a blown gasket

bump

 

Well the nice thing about our cars is that it can tell how volatile the gas is, so if you put regular in it will be more volatile, the computer will compensate for the by adjusting the cam phasing and timing, it will not hurt your car, now that is assuming it is stock.

 

Just use 93 cheapy McCheap pants!

 

i am i was just pondering the question this afternoon while fishing and now i wanted an answer

 

The car is tuned for 91 but also has an octane map for 87. Using 93 makes no difference unless you have tuned for it or unless you are getting knock with 91.

If you run 87 all the time the car will always run off the low octane map. That means less gas mileage and less power. The other problem with running 87 is that if you do decide you want to get on it hard you WILL knock. The car will pull timing to compensate, but any knock is bad knock and it only takes one detonation to cause damage. So if you do run 87 I would not drive hard. If you run 89 it will be better but if you are bucking up for 89 might as well buck up a little more and use the 91.

Moral of the story: You bought a performance car so use 91 octane fuel

 

damage?

You could make us all dumber

 

I always run 94 octane MMMM