The differance is oil content
2-stroke airplane fuel usually has at least 18% oil
Heli fuel 20% oil
Car fuel has 10-12% oil (race blends)

Car engines run from 30,000-40,000 rpms
Airplane engine around 15,000-18,000 tops (4-strokes less)

The airplne fuel will let the engine run cooler but a lot slower, the high oil content will want to bog the engine and not let it reach top rpms. It will last a lot longer though