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).
Comparative data table for various American car models including Chevrolet, Oldsmobile, Pontiac, and Buick.
| Identifier | ExFiles\Box 127\4\ scan0114 | |
| Date | 6th April 1938 guessed | |
| CFTN 20 35 50 60 Comp. Ratio 11% 7% Chevrolet Master 112.5 23 20.2 17.2 15.5 6.3 32.0 44.2 Oldsmobile Six 114 20.5 20.1 17.2 15.2 6.1 33 45 Pontiac 108.5 20.75 20.0 17.0 14.5 6.2 32.5 45 Buick 8.41 111 18.2 17.2 15.2 14.8 - 31 43 Oldsmobile 8 112.5 20 18.7 15.7 13.7 - 29 41 Pontiac 8 114.5 22.6 20.7 17.7 15.0 - 33 44 | ||