ummm...i was told to pump 93 to keep ur motor clean from getting gunk build dups...thats f-ing bull crap...no mater what ur still going to get all that gunk build dup from time to time from shiits going through your intake into IM and into head......from my point of view......if ur compression is low as smuck dont think pumping 93 will actually give u more power on ur rpm band. If your car is a totally high compression motor like 11+ CPR then yes 93 would be a higher octane for a better combustion for the motors performance....!