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).
Note on an oil consumption test for vehicle 1200, conducted by Mr. Royce, comparing different oil brands.
| Identifier | ExFiles\Box 144\3\ scan0001 | |
| Date | 5th April 1910 | |
| X986 3800 Oil consumption on 1200 - taken by Mr. Royce Engine running on Price's Motorine oil As compared with similar run on Valvoline should say car ran more full throttle. 382 miles on 4 1/2 pints equals 680 m.p.g. Recorded 5-4-10 | ||