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).
Petrol consumption test results comparing standard top gear and over-drive on the Phantom III.
| Identifier | ExFiles\Box 147\5\ scan0122 | |
| Date | 16th February 1937 | |
| FILES. 1249 Rm{William Robotham - Chief Engineer}/FD.{Frank Dodd - Bodies}17/JH.16.2.37. PETROL CONSUMPTION TESTS COMPARISON BETWEEN STANDARD TOP GEAR AND OVER-DRIVE ON THE PHANTOM III. We have checked the petrol consumption of 36-EX using the standard top gear and the over-drive. The car was driven hard reproducing continental road conditions as near as possible as the average speed will show. We give below the consumption figures, these are the average in both directions. a.{Mr Adams} Standard production top gear. Petrol used - 2 gallons ........ Gravity tank used. Average speed 67.56 m.p.h. Consumption ..... 7.47 m.p.g. b. Using the over-drive gear. Petrol used 2 galls. ...... Gravity tank used. Average speed 67.77 M.P.H. Consumption 8.05 m.p.g. Rm{William Robotham - Chief Engineer}/F.Dodd. | ||