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).
Comparing petrol consumption test results for different carburettor setups on the 20-G-IV chassis.
| Identifier | ExFiles\Box 102\1\ scan0267 | |
| Date | 12th February 1935 | |
| To Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} c. to Hs{Lord Ernest Hives - Chair}/CIS. Hs{Lord Ernest Hives - Chair}/GR.{George Ratcliffe}3/KW.12.2.35. Petrol Consumptions on 20-G-IV. Reversed throttle carburetter; XB7 needle; weak at low speeds. 30 MPH. constant/ ½ gallon/10.4 miles/20.8 MPG. Fast run not exceeding 60 MPH/ ½ gallon/8.8 miles /17.6 MPG. Reversed Throttle Carb. XC1 needle, carburation O.K. 30 MPH. constant/ ½ gallon/11.4 miles/22.8 MPG. Fast run not exceeding 60 MPH/ ½ gallon/9.2 miles /18.4 MPG. Modified carburetter to LEC.4292; XC needle; as tested by Mx.{John H Maddocks - Chief Proving Officer} 30 MPH. constant/ ½ gallon /9.8 miles/ 19.6 MPG. Fast run not exceeding 60 MPH/ ½ gallon/9.1 miles/18.2 MPG. Hs{Lord Ernest Hives - Chair}/G.Ratcliffe. | ||