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 graph showing top gear acceleration for a Buick Light Six versus a 20 HP Rolls-Royce.
| Identifier | WestWitteringFiles\S\March1928-May1928\ Scan047 | |
| Date | 19th March 1928 | |
| BUICK LIGHT SIX V 20 H.P. TOP GEAR CAR SPEED (M.P.H) TIME (SECS) Buick 20HA 31cwt RR AJL 19.3.28 | ||