I just sent an email to Cobb about this, but I'm also curious about what thoughts any of you might have. I'm in Alaska, and the best fuel I can get is 90 octane. I want to pick up an accessport and run Cobb's stage 1 map (going to TBE/stage 2 fairly soon), but I'm afraid running the 91 octane map on this sub-standard gas would be ill-advised. Should I find a place to do a custom map? I'd have to do it through email, since there aren't any tuning shops up here. I appreciate any thought/ideas/info you might have.