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 mileage and petrol consumption for a recent trip to Portsmouth on vehicle 9.B.V.
| Identifier | ExFiles\Box 98\4\ scan0159 | |
| Date | 20th August 1940 | |
| To Rm.{William Robotham - Chief Engineer} from Rm{William Robotham - Chief Engineer}/Wym.{G. Harold Whyman - Experimental Manager} 9 BV Rm{William Robotham - Chief Engineer}/Wym.{G. Harold Whyman - Experimental Manager}1/ET.20.8.40 Recent trip to Portsmouth etc.. on 9.B.V.: Speedometer mileage 511 Petrol used........ 29 gallons Petrol consumption 17.6 m.p.g. Rm{William Robotham - Chief Engineer} ✓ Rm{William Robotham - Chief Engineer}/WYM.{G. Harold Whyman - Experimental Manager} [Signature] | ||