I use 93 octane in most cases. There is no difference if I use 92 or 91 either. Runs like crap if I use 89 octane. The station I use buys whatever brand they can get cheap. They usually beat everyone else by as much as 10 cents/gal. With gas prices the way they are this is my main concern.We don't have Sunoco here either so I wouldn't have means to do a comparison. We do have Ammoco which is supposed to be very good.
Oh, I just remembered I do have access to 103 octane if the place still carries it.
Hey Clauser, what part of Chicago do live?
92 Volvo 740 Wagon aka "Mutt mover"