Originally Posted by 1slow370

all i'm going to say on that is the owners manual isn't god and you won't go to hell for not doing as it commands, i'd never run crap fuel in my car but it would retard the timing if you ran 85. there is the touchy issue that you would have to have increased knock before the timing would be reduced which at higher rpm's might cause a little damage before the ecu retarded the timing a half second later, but it could also be argued that you could get an accesport and have one of the maps be tuned with less timing for 85 if you are really a cheap basterd. and don't forget his comment about his elevation he MIGHT be able to run 85 due to the reduced pressures.