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).
Performance calculations for speed, time, and displacement in different gears.
| Identifier | ExFiles\Box 29\3\ Scan011 | |
| Date | 16th September 1909 guessed | |
| X1010 4200 60544 3713 lbs total average 27 mph 6.5 min 12.95 ton miles. 4.9 3rd gear 1 1/2 min at 30 mph. 2nd 5 min at 24 1/2 mph cu ins displaced = 1449000 per ton mile = 296500 cu in ditto per min = 45600 cu in axle 2nd gear full thr 6 1/2 min cu ins displaced = 1,710,000 per ton mile = 350000 ditto per min = 53800 R | ||