does anyone use 100LL av gas ?

RustyRatRod said

AV gas has additives in it that can be bad for your car. There are stabilizers and such in it that allows it to perform at altitude. Read up on it. We've argued this point before and I was totally lambasted, but it's true. You don't need to run AV gas in your car.

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This statement is partially true and I was involved in that debate. I stand by my recommendation to use Race-gas additive if real race gas is not available. However, AV gas mix will work on older engines just fine.

The only issue is with the lead in the fuel and how it will act on your valve train, and rubber gaskets.