With the rest of the world having long-since moved away from leaded fuels, aviation gasoline, or "avgas" for short, seemingly exists as a final holdover from a bygone era. The most ubiquitous avgas ...

Gasoline ; Tetraethyllead ; From the mid 1920's until the mid 1980's motor gasoline fuel contained an additive, tetraethyllead, that improved fuel performance by preventing preignition in the ...