[Kaslin]

Question: If my car uses 87 octane rating and the ethanol free ratings are 89 91 is the 89 rating save for my car? I have a 2004 Chevrolet Cavalier

[ROCKLOBSTER]

Question: If my car uses 87 octane rating and the ethanol free ratings are 89 91 is the 89 rating save for my car? I have a 2004 Chevrolet Cavalier

Why, are you afraid it won't "ping" enough?

[ez]

According to my mechanic yes. I run 91 premium in my 87 rated pickup to avoid ethanol and he says it shouldn’t hurt and in fact will improve gas mileage.

[Jack Hydrazine]

Yes it is. Alcohol-free gasoline is better for all engines. Adding alcohol increases chamber temp and air pollutants created plus it decreases mileage.