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).
Graph showing petrol consumption, plotting miles per hour against miles per gallon for a 20/25 HP model.
| Identifier | ExFiles\Box 5a\2\ 02-page185 | |
| Date | 25th February 1936 | |
| PETROL CONSUMPTION. MILES PER HOUR MILES PER GALLS 20/25 HP 5.25 COMP. 9/41 HYPOID 25-2-36 HSH | ||