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 test results for petrol consumption using a 14-tooth axle compared to a 16-tooth axle.
| Identifier | ExFiles\Box 49\1\ Scan353 | |
| Date | 7th July 1921 | |
| CJ. from Hs. {Lord Ernest Hives - Chair} X4299 Hs {Lord Ernest Hives - Chair} 6/LG7.7.21. X4299 RE. 14-TOOTH AXLE. X3056 With reference to your query - Re. Petrol consumption with the 14-tooth axle. The tests we have taken show that there is approximately 10% increase in the petrol consumption when using the 14-tooth axle compared with the 16-tooth axle. Hs. {Lord Ernest Hives - Chair} | ||