From what I have read and heard, I agree with aschrager. I made a decision when I bought my car to only use Top Tier brands of gasoline and then only the correct octane. So far it's only been Chevron, Texaco and Shell. IMO if someone with a Crossfire or similar car is going to try and save a few pennies on gasoline they screwed up when they bought the wrong car. They should have bought a rice burning hybrid. IMO.