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).
Test results for oil consumption on Unit U7S with standard piston and rings.
| Identifier | ExFiles\Box 144\3\ scan0072 | |
| Date | 8th July 1936 | |
| To Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} X1220 Hs{Lord Ernest Hives - Chair}/WB.{Mr Brazier/Mr Bell}9/JH. 8.7.36. 18-G-IV Oil Consumption. - Unit U7S: Standard Piston and Rings. Total mileage to date 6253. Miles run 201 Average speed 42 Oil used 5¾ pts. Oil cons. 281 m.p.g Petrol Cons. 12.6 m.p.g. Average Air Temp. 21°C. " oil " 75°C. " Water " 85°C. " press. sq/lb. 28 Hs{Lord Ernest Hives - Chair}/W. Brazier. | ||