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).
Comparison table of fuel consumption (MPG) data from tests in France and England.
| Identifier | ExFiles\Box 147\5\ scan0168 | |
| Date | 24th September 1940 guessed | |
| - 2 - FRANCE ENGLAND 30-G-V11 B. 80. Engine. 10.53 MPG. Test Run by Rm.{William Robotham - Chief Engineer} over 320 miles. 14.88 MPG. Bus Service. 12.8 MPG. P.111 32 Ex 10,000 Miles Test Consumption runs by 24.6.35 to14.9.35 Rm{William Robotham - Chief Engineer}/Ratcliffe over 189 miles. 7.8 MPG. 28.10.36 8.8 MPG. 7,000 miles Test 11.11.36 10.2 " 21.5.36 to 25.6.36 12.11.36 8.8 " 13.11.36 9.7 " 9.0 MPG. 13,000 miles Test 1,600 miles Traffic 28.6.37 to 27.8.37 running in London. 8.22 MPG 8.6.37 to 15.6.37 9.8 MPG. P.111 33 Ex NIL Consumption run by Rm{William Robotham - Chief Engineer}/Gry.{Shadwell Grylls} over 395 mls. 21.3.36 - 9.6 MPG. Rm{William Robotham - Chief Engineer}/Roberts over 197 miles. 29.9.36 - 7.88 MPG. 30.9.36 - 7.6 MPG. P.111 35 Ex 20,000 miles Test 6,000 miles Traffic 26.1.37 to 6.5.37. running in London. 8.14 MPG. 21.9.36 to 7.12.36 8.9 MPG P.111 AVERAGES. 8.29 MPG. 9.03 MPG. Rm{William Robotham - Chief Engineer}/Wym.{G. Harold Whyman - Experimental Manager} | ||