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).
Record of petrol consumption tests with various engine heat configurations and radiators.
| Identifier | ExFiles\Box 147\5\ scan0024 | |
| Date | 16th January 1909 | |
| R.R. 148 (6 H) (C. 776. 18.12.08) G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 6526 3800 (+2300) X459 Petrol Consumption with heat: Consumption with various engine heats taken by W. Hallam 16/1/09 and 17/1/09 to prove deficiency of petrol consumption with new (clear) radiators | Heat of water in radiator | Heat below floorboards | Consumption miles per gallon. | Atmospheric. Temp. | Run between | | :--- | :--- | :--- | :--- | :--- | | a, Std car 60° | 29.5° | 13 1/2 | 2°c | Derby and Ashbourn | | B, Gauze in front of radiator 70° | 33° | 16 | 0°c | Ashbourn and Leek. | | D, No fan 84° | — | — | 3°c | Macclesfield and Marple. | --- | a, Standard car 69.5° | 20°c | 15 1/2 | 5°c | Marple and. Adlington | | d, No fan 80° | 46°c | 16 1/2 | 7°c | '' | | e, gauze fixed no fan hot air pipes fixed 96° | 71°c | 18 | 10°c | '' | | g) No fan. hot air pipes fixed 66.5° | — | 15 1/2 | 10°c | Marple to Macclesfield | | h) hot air pipes fixed only 65.5° | — | 14 1/2 | 10°c | Macclesfield to Leek. | | ||