Is there a difference between different grades of gasoline? Like Shell V-Powe and Exxon Supreme? I use V-Power and it seems better than the lower octanes although I've heard it makes no difference whatsoever.
If your car is made to run on 87 octane regular, and is in good condition, then higher octane fuel is just flushing money out the exhaust pipe. Use whatever it says to use in the owner's manual.
Please Scroll Down to See Forums Below 
