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).
Notes on a fuel consumption test for car No. 6, with varying weights and gearing.
| Identifier | ExFiles\Box 147\5\ scan0019 | |
| Date | 14th February 1907 guessed | |
| X459 380.0. Consumption test No 6. short. Test body & driver 9.28 miles for 1/2 gall 2553 lbs = 22.48. per ton mile geared 22/20. pinion. No 6 stat long 60501. 20 tooth pinion Run Ordinarily on direct drive Total weight 3372 lbs 14 miles per gallon Same car. 3400 lbs ballast to Mc to Knutsford .85 throat. (Plugs very clean) ordinary driving . 15.8 m.p.g. | ||