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).
The petrol consumption of the 7-CA car at various speeds.
| Identifier | ExFiles\Box 183\M22\ img019 | |
| Date | 10th July 1917 | |
| X.3056 7CA c/ 196 Extract from EH6/LG10.7.17. X.682. 7-CA CAR. 66 X.3056. With reference to the petrol consumption on this car Mr. Platford has run this car for a long run. The consumption when going fast and/covering ground is 16 m.p.g. if the speed is reduced to about 25 m.p.h. and best consumption is tried for, 19 to 20 m.p.g. can be obtained. This consumption is a great improvement on what this car used to do, taking into account present petrol. | ||