From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Table showing single-cylinder octane number data for blends in aviation gasoline.
| Identifier | ExFiles\Box 150\1\ scan0217 | |
| Date | 30th January 1936 guessed | |
| Table IV Single Cylinder Octane Number Data for Blends in Aviation Gasoline of 74 C.F.R.-M.M. Blending Agent Volume % Added A.S.T.M. Octane Numbers Clear 1 cc. Ethyl Lead/Gallon 3 cc. Ethyl Lead/Gallon Clear Blending Value Army Octane Number 3 cc. Ethyl Lead/Gallon Series 30 at 375°F. {Mr Friese} Octane Numbers Clear Isopropyl Ether 0 73.5 82.0 87.5 - - 69 10 76.3 84.1 89.3 102 - 72 25 80.5 88.6 94.0 101 - 78 40 85.0 - 97.5 102 100 82 Iso-Octane 0 73.5 82.0 87.5 - - 69 10 76.0 84.0 89.0 99 - 72 25 79.4 86.8 91.4 97 - 76 40 83.0 - 94.2 97 99 80 50 85.5 93.0 96.0 98 - 82 | ||