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).
Fuel consumption test results under various special driving conditions for car 7#1.
| Identifier | ExFiles\Box 147\5\ scan0006 | |
| Date | 10th May 1908 | |
| (2300) all 3rd gear 20 m per h Consumption - special driving ways on car 7#1 car 4 1/2 cwt body 5 up. X459 Ordinary driving carb. set. 16.8 m per gall at 20 m per hr 3rd gear. Steady. 20 m per hr level - mixture cut down under all conditions to just run = 20 m per gall Give & take road Mac.{Mr Macintosh} to Cheadle - car run free wherever possible. & mixture kept to suit. 26.8 m per gall. - full power when possible + then free wheel. Dead level - steady 20 m per hr - mixture cut down to suit 20 m.p.g " 25. lbs fire to 15. - motor steady (weak rock) / 20. VP Cohen. .10/5/08 LP{Mr Lappin} h VP | ||