An ordnance report on German military fuels and lubricating oils, from Tactical and Technical Trends, No. 30, July 29, 1943.

b. Aviation Gasolines

German aviation fuels are of particular interest. These are of two types: a blue B-4 fuel (bomber grade) of 89 to 91 octane and a green C-3 (fighter grade) of 93 to 96 octane. The B-4 grade consists of a 71.5 to 74 octane base gasoline plus 4.5 to 4.75 cc tetraethyl lead per gallon, while the C-3 grade consists of 83 octane base gasoline plus 4.26 to 4.6 cc of lead. The C-3 fuel is outstanding in that it has a particularly high rich mixture rating which is given as 110 British Engine Performance Rating compared with 100 for British Air Ministry 100 fuel. This appreciation in performance rating with rich mixture is undoubtedly due to the high aromatic content of the green fuel which is reported as 37.42 and 38.59 percent on two samples.

Lone Sentry: Summary of Captured Fuels and Lubricants (WWII Tactical and Technical Trends, No. 30, July 29, 1943)

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