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).
Comparative consumption tests on chassis 1414 with two different geared axles, 18x52 and 16x52.
| Identifier | ExFiles\Box 147\5\ scan0017 | |
| Date | 1st January 1906 guessed | |
| 3800 COMPARATIVE CONSUMPTION TESTS on chassis 1414 with 18x52 + 16x52 geared axle X459 Left Table: 16 x 52 Speed. | Miles per Qr. | M.P.G. 20 m.p.h. | 4 | 16 30 " | 3.5 | 14 40 " | 3.25 | 13 all out. | 2.9 | 11.6 Average = 13.4 Helner body Double enclosed limousine Right Table: 18 x 52 Speed. | Miles per Qr. | M.P.G. 20 M.P.H. | 4.25 | 18. 30 | 3.9 | 15.6 40 | 3.5 | 14 all out. | 3.1 | 12.4 Average = 14.4 Roads Good RR 41 cwt total weight | ||