Gas on your car?

Originally posted by hondaman-iac
it's all in the timing. i noticed my car running like crap if i use something different than 87 or 92 (timing in between)

but i don't understand how if you kept the same timing, and had different gas, how my understanding wouldn't be nessicarily invalid. the gas, because of it's chemical structure, would still combust faster because it reacts with the oxygen more while burning.