Will that harm the car? I borrowed a '97 Prelude and put 87 in it by mistake because I'm so used to filling up my Civic with it. I found out later that it requires premium gas. I'm hoping that everything is ok; maybe the ECU just adjusted timing to compensate for weak gas? I can't sleep at night now, haha.

 

it will be ok as long as you dont go mashing around in vtec

put 91 in it next time, we are in cali we dont go much of a choice unless you go to the 76 off lapaz and get 104, i think thats to nutty though lol.

 

just throw some premium and some octane booster in it