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).
The results of petrol consumption tests on a 20/25 car compared to a standard model.
| Identifier | ExFiles\Box 102\1\ scan0182 | |
| Date | 30th May 1934 | |
| To SG.{Arthur F. Sidgreaves - MD} c. to Wor.{Arthur Wormald - General Works Manager} c. to E.{Mr Elliott - Chief Engineer} c. to By.{R.W. Bailey - Chief Engineer} c. to Px. Attached are copies of some consumption tests carried out on the 20/25 car which is now running 10,000 miles. This was compared with one of our standard 20/25 HP. cars. The cars were run one behind the other, petrol consumption taken and the carburettors changed over and the test repeated. It will be observed that both at high average speeds of 42 m.p.h. and lower average speeds of 31 m.p.h. the consumption of the two carburettors is to all intents and purposes identical. He/Rm.{William Robotham - Chief Engineer} | ||