Patent ID: 7862629

Claim:
An improved leaded aviation fuel composition for piston driven aircraft which comprises: (1) an aviation gasoline base fuel having an unleaded MON of at least about 90 and containing between about 0.013 to 0.6 grams lead per liter of gasoline base fuel from a lead-containing octane improver, and (2) 0.08 to 0.40 wt % of at least one aromatic amine effective to boost the peak indicated mean effective pressure as measured by ASTM D909 by at least 1 psi above the PIMEP of the leaded but unaminated base fuel, said aromatic amine having the formula NH 2 â€”Arâ€”(R 1 ) n wherein R 1 is C 1 -C 10 alkyl, Ar is a phenyl group and n is an integer from 0 to 3 with the proviso that R 1 is positioned in the meta- or para-position(s) on the aromatic ring, wherein the resulting aviation fuel composition has a peak indicated means effective pressure (PIMEP) as measured by ASTM D909 greater than about 210 psi.