Dear Dan;
I believe so.
The aircraft industry has escaped the wrath of the EPA for years, because the FAA 'said so' and they have more 'juice' in Congress.
The "horizontal opposed" engine used in most small planes (Same as VW/Porsch & BMW bikes) was legislated out of the USA by Congress because it passed all the EPAs regulations W/O any 'smog' equipment.
Go figure.
FYI: Avation fuel commonly called AV-Gas has been used by Hot Roders for decades. "Try it you'll like it".......
