Is 91 Octane bad for our cars?? My dad thinks that this car should only use 91 octane, I also read somewhere if I use 89 or 87 that the engine will make a nocking noise just like mine is doing right now.. I just started using 91 today.. The car feels like its got more power at low RPM's
, but the price og 91 octane is 2 bucks which sucks!!
SO IS 91 BAD FOR MY CAR OR SHOULD I USE 89??
