on monday i was on E and i only had $10 so i decided to put 87 octane usually i put 91 and when i drove the car the next day it felt like shit and it used up all the gas like in 40 miles it sucked...is it true that 100 octane fuks with your motor? the 1st week that i got my 96 gsr me and all my freinds chiped in $10 and we got like $50 and we put 5 gallons on 100 octane at the 76 by my house and that gas made my car feel like it was on steroids when i hit 5500 rpm u could hella hear the vtec...and it we raced 4 times and drove like 50 miles and i still had gas, so why do ppl say 100 octane is bad?