"Top" Tier 10% ethanol is a bad deal (.) Phillips 66, or any of these on this list.... I don't care if it makes this 'top tier' list. If it says 10% ethanol mix, I drive on to another station. In this regard Top Tier is a sham, and means little to me. It is a minimum standard of sorts I guess. Those that would do in a pinch are Chevron and Shell. But I would still avoid if they were a 90/10 mix. BP / Amoco ultimate 93 is the ticket in my use, which I have used almost exclusively since 1991 in all sorts of vehicles. The bimmers love it.