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).
Road test log detailing fuel tank levels, mileage, and gauge readings for a Straight Unit.
| Identifier | ExFiles\Box 44\3\ Scan084 | |
| Date | 24th November 1928 guessed | |
| Straight Unit . 1"/16 hole. Approx. in tank. Mileage. Gauge. 8 411 8 411 0 421 1 6.9 431 (20) 1.5 441 4 5.8 451 (40) 4 4.75 468 (57) 4 Emptied tank 4.75 Night driving very slow against gale. Wet roads. Average 20 m.p.h. | ||