> AvGas is typically only in the 105-120 range, and it's used in turbine engines with compression levels that would reduce a car's ICE to shrapnel.
No. Standard avgas is 100LL (100 Octane, low lead). It's just like gasoline from the auto pumps, but the octane level is higher and there's still some lead in it, where the auto industry is fully unleaded. (There are some aircraft that can handle lower-octane mogas, but they're rare.)
Turbine engines typically use Jet-A, which is a diesel-like, kerosene based fuel.