In aviation, it uses the standard high-octane fuel for small piston engine airplanes.
Piston engines, gasoline powered cars work on the same principle but require higher performance airplanes.
It is a high lead content and blue color paint.
Avgas 100 has a low lead content.
Avgas 100LL contains 0.56 g/lt of lead.
This ratio is for pure gasoline 100, ie ASTM D 910 and UK DEF STAN 91-90 with the same specifications listed.