is a high-quality gasoline manufactured under stringent
controls to meet the rigorous performance and safety requirements of
piston-type aircraft engines. Volatility of
aviation gasoline is closely controlled since, in most aircraft engines,
excessive volatility can lead to vapor lock.
Aviation gasolines generally have lower vapor
pressure and a narrower distillation range than automotive gasolines
(see distillation test). Aviation
gasolines are formulated to resist chemical degradation and to prevent fuel
system corrosion. There are two basic grades of aviation gasolines (based on
their antiknock value): 80 (80 lean/87 rich)
and 100 (100 lean/130 rich). Aviation gasoline has different properties than
turbo fuel, which fuels gas-turbine-powered
aircraft.
Also see lean
and rich octane number.