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).
Comparing the performance of 20 HP cars using various brands of petrol.
| Identifier | ExFiles\Box 32\1\ Scan096 | |
| Date | 25th October 1923 | |
| R.R. 493A (40 H) (SL 42 12-7-23). J.H.D. 796 EXPERIMENTAL REPORT. Expt. No. 1555 REF: Hs{Lord Ernest Hives - Chair}5/LG25.10.23. COMPARISON OF PERFORMANCE ON 20 HP. CARS - 4-G-11 - 3-G-11 AND 79-AO (10,000 MILES TEST CAR) - WITH VARIOUS BRANDS OF PETROL. Chassis No. | Test. | Shell No.1. | Shell Mex. | Red Line. ---|---|---|---|--- 4-G-11 | Time on hill in secs. | 117 | 117.5 | 114 | Max. speed on hill. M.P.H. | 39 | 39 | 40 | Min. speed on hill. M.P.H. | 15 | 15.5 | 16.5 3-G-11 | Time of hill in secs. | 109.5 | 110.5 | 110 | Max. speed on hill. M.P.H. | 39.75 | 38.75 | 39.5 | Min. speed on hill. M.P.H. | 19.75 | 19 | 19.5 79-AO. | Time on hill in secs. | 124 | 133 | 120 | Max. speed on hill. M.P.H. | 39 | 38.5 | 38.25 | Min. speed on hill. M.P.H. | 14 | 11 | 15 MAXIMUM SPEED ON LEVEL IN 700 YDS. STARTING AT 40 M.P.H. AVERAGE OF TESTS. 4-G-11 | speed test. | 55.6 | 55.9 | 55.1 3-G-11 | " " | 54.5 | 53.75 | 54.25 79-AO. | " " | 55 | 54.5 | 55.5 | ||