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).
Table of comparative tests of petrol consumptions taken on Brooklands.
| Identifier | ExFiles\Box 29\3\ Scan110 | |
| Date | 18th September 1922 guessed | |
| Spare COMPARATIVE TESTS OF PETROL CONSUMPTIONS TAKEN ON BROOKLANDS. Condition of test. | 15 tooth axle. high comp: | 15 tooth axle. low comp: | 14 tooth axle. high comp: | 14 tooth axle. low comp: Car run at 30 m.p.h. on Track. | 16 m.p.g. | 15 1/2 m.p.g. | 14 1/2 m.p.g. | 14 1/2 m.p.g. Car run at 50 m.p.h. on Tract. | 14 1/2 " | 14 1/2 " | 13 1/2 " | 13 1/2 " Car run 1 lap 20 " " " " 30 " " " " 40 " | 15 1/2 " | 14 1/2 " | 14 1/2 " | 14 " " " " 50 " finish at 60 " Run from Brooklands to Derby (140 miles) average speed 31 MPH. | 14 " | | 13.75 " | Run from Derby to Brooklands - 140 miles. | | 13.5 " | | 14 " | ||