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 plotting constant speed petrol consumption in miles per gallon against miles per hour for the 7BV model.
| Identifier | ExFiles\Box 122\4\ scan0213 | |
| Date | 14th November 1938 guessed | |
| CONSTANT SPEED PETROL CONSUMPTION - 7 B V M.P.G. M.P.H. LB1 NEEDLES [TOP GEAR] R R X NEEDLES [TOP GEAR] OVERDRIVE [LB1 NEEDLES] | ||