I get free 89 octane at work and I still don't use it. My Impala sucks it up though. My boss thinks I'm just bein' a big shot because I said my car doesn't want that grade and I'm not putting it in.HE puts it in both his vehicles which call for 93 but is too much of a cheapskate to buy his own fuel. I am an "I told ya so" kinda guy, so I'm just sittin' back and waiting.