I am glad that someone brought up this topic. 95% of the time I burn 93 Amoco with great results, however, if I put in 87, 89 and other cheap gases in there is no notible difference perfomance difference other than I get a few miles less per gallon gas mileage.

I drive conservatively. Even though it saus on the fuel gause (Premium Gas Only), do I really have to fill up with 93 Octane. I once heard that was for only if you beat on the engine quite often. I don't know, will 87 and 89 damage the engine?