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 test data for a Hupmobile Car 16.9 HP, showing engine revolutions, load, horsepower, and MEP.
| Identifier | ExFiles\Box 22\2\ Scan004 | |
| Date | 24th March 1921 | |
| X.4212 24.3.21. HUPMOBILE CAR 16.9 HP. REVS. | lbs. | HP. | MEP 500 | 79 | 7.625 750 | 74 | 10.714 1000 | 75 | 15.478 | 68 1250 | 75 | 19.098 | 70 1500 | 74 | 21.428 | 64 1750 | 73 | 24.652 | 62 2000 | 67 | 25.868 | 56 Time for 5 galls. of water at 75° 3 mins. 23¼ secs. | ||