Originally posted by LudeRage
I just use 87 but I don't have a GSR either. My sister's boyfriend has a Corrado VR6 with some engine work and he used to only use 94 octane. After a while he realized the insignifigance of it and now usually just uses 87 or 91. I think some people just like to fill up with Premium or Super to pump up their egos..no pun intended ahha...
You're kidding right? Some engines require high octane fuel in order to prevent premature detonation of the fuel/air mixture in the cylinder before spark ignition - this is usually the case in high compression or multi-valve (3 or more valves/cylinder) engines. Regarding your boyfriend's VR6, he should be running premium (his engine has a 10.1:1 compression ratio, pretty high for a V6) so he's probably running with a slight power loss and retarded timing and/or pinging/knocking occuring.