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In answer to Jorge Daniel, the airplane is immaterial, it's the engine that
type that might allow one to use the non-leaded automobile fuel. The lead
additive in Avgas (tetra-ethyl lead, or TEL) provides the black magic that
prevents detonation (or at least, increases the detonation margins in
engines asked to provide a lot of power at moderate to high compression
ratios). Certain relatively low compression engines may have such a large
detonation margin that leaded fuel isn't needed. So, as you might infer,
it's the engine requirements, not the airframe, that determines whether a
non-leaded fuel can be used safely.

Notice that I did not say you could use out-of-the-pump auto gas. Even
without TEL, the stuff one puts in their airplane tank must be good stuff.
No oxygenation additives, such as any of the various alcohols allowed.

Unless you can be sure that the gas you use isn't loaded with "EPA Juice",
don't use it.

Dan Schaefer

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