[asphaltgambler]

AV gas is formulated to run in cold to very cold temps with much less oxygen molecules than on the ground. Also, aircraft piston engines are not high compression. Because of this it has less BTU's per unit than comparable 'race' gas of similar octane. And when run in a performance engine, especially carburetated, the fuel droplets tend to vaporize in the intake manifold, leading to further issues running lean and stumbling on hard acceleration.

I tried this in the mid '80's on a hot street BBC 468 with nitrous. It just never ran to its expected potential. The plugs read lean even though the jetting would've been 'fat'. I knew some of this going in, but AV gas was less than 1/2 price per gallon than Cam II at that time. I could not tune the short comings out of it. I switched back to race gas and immediately noticed better overall performance and had to pull some jetting out of it