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).
Record of oil consumption for car B 4 GA, detailing oil added at various mileage points and the calculated m.p.g.
| Identifier | ExFiles\Box 144\3\ scan0191 | |
| Date | 2nd April 1937 | |
| CX.{Major Len W. Cox - Advertising Manager} B 4 GA - Oil Consumption. - - - - - - - - - The sump of the above car was full at the speedo reading of 29173. 29701 2 qrts. 29978 1 qrt. 30852 1 qrt. 31128 1½ pts. Miles for month - 1955 to 1 gallon 1½pints - 1646.4 m.p.g. RC.{R. Childs} ✓ RC{R. Childs}9/L/2.4.37. POST. Received 3 APR 1937 | ||