Patent ID: 8628594

Claim:
An unleaded avgas fuel blend, comprising: (a) at least one unleaded aviation gasoline base fuel having a selected motor octane number of about 96 or more; (b) one or more aromatic amines having the formula wherein R 1 , R 2 , R 3 and R 4 are hydrogen or a C 1 -C 3 alkyl group, said one or more aromatic amines comprising from more than zero percent (0%) to less than six percent (6%) by weight of said unleaded avgas fuel blend; (c) an amount of one or more dialkylated benzenes effective to increase the detonation performance of said unleaded fuel blend in a full scale engine to the equivalent, or better than the detonation performance in said full scale aircraft engine of Grade 100LL avgas which minimally meets the minimum octane rating requirements set forth in ASTM Standard D910-07a; and (d) wherein said unleaded avgas fuel blend composition is suitable as a drop-in substitute for Grade 100LL avgas.