+fireamx, I agree! It all comes down to how you treat your car if you plan on keeping it for the long haul.
I've tried regular gas and haven't noticed performance problems but...
I keep an eye on the tail pipes and find that the lower octane fuel does not burn as clean and I don't get as good MPG's. I'll stick with 91 to 93 octane for my own peace of mind. I think the better MPG's tells the story on how efficiently the engine is running. Last fill up I got 28.2 MPG. I only use Marathon or Shell gasoline here in Ohio. Fortunately the Marathon station has "Super Thursday" when they charge the 91 Octane price for 93 Octane fuel. YEAH BABY...