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).
Test report on engine fuel consumption and power output at various carburettor and magneto settings.
| Identifier | ExFiles\Box 147\5\ scan0015 | |
| Date | 21th September 1911 | |
| Consumption tests. X459 Standard 1700 ca Taken by Lowe Carb. | Magneto minutes early | 1000 Revs HP | Pints HP hour -5 | 10 | 23.9 | .85 | Slight misfiring -4 | 8 | 26.6 | .8 -3 | 7 | 29.4 | .75 -2 | 6 | 31.4 | .77 -1 | 5 | 31.8 | .89 -0. | 4 | 32.4 | - Max power Demarcation line is indefinite. Carburettor was set 2 notches weaker than normal. Further tests when dyn is again running Best water result yet is 1 Gall water 30 secs with free engine, and one Gall 25 secs with stiff engine. 1250 revs 65 cent 3800 | ||