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 data table showing time versus speed for a 2nd Buick Car.
| Identifier | ExFiles\Box 21\5\ Scan005 | |
| Date | 3rd January 1920 guessed | |
| Contd. -2- Time. M.P.H. 2nd. O mins. 10 Buick 1/4 " 22 Car. 1 " 26 1 " 47 secs. 34 YY | ||