Av gas is no problem, I would run it up to about 13 to 1 as is. Add any one of a number of octane boosters with MMT and I might even try it at 15 to 1. Av gas is rated different, it's 100 octane lean, 130 rich. For those that don't believe you really have no understanding of fuel properties. If you look at the characteristics it is almost identical to most 110 fuels. It has to burn very clean so it doesn't leave deposits that could foul plugs, don't want that at 10,000 ft. And that 10,000 ft thing, it as to operate correctly from 0 ft up. Wake up and smell the BS the fuel companies want you to believe...