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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 comparison of 20 HP cars using various brands of petrol.

Identifier  ExFiles\Box 20\4\  Scan034
Date  24th December 1924 guessed
  
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 on 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. | " " | 54.8 | 53.75 | 54.25
79-AO. | " " | 55 | 54.5 | 55.5
  
  


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