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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 the petrol consumption and performance of a 59.9 HP Napier and a 48.4 HP Rolls-Royce Silver Ghost.

Identifier  ExFiles\Box 20\6\  Scan013
Date  17th October 1910
  
B
17th October 1910.

Mr. Johnson.

Re Petrol Consumption.

59.9 H.P. Napier.

Consumption over 799 miles from London to Edinburgh and back at an average speed of 20.2 m.p.h...........19.85 m.{Mr Moon / Mr Moore} per gl.{G. Linnett}
or 42.57 ton miles per gall.

Total running weight.........................4928 lbs.
Wind resistance area of body..................10.4 sq. ft.
Speed at 1000 r.p.m. on top gear (assum-ing 34 inch wheels)..........37 m.p.h.

48.4 H.P. Rolls-Royce (Silver Ghost).

Consumption over 420 miles from Hatfield to Glasgow, (average speed unknown)......................20.8 m.{Mr Moon / Mr Moore} per gl.{G. Linnett}
or 40.8 ton miles per gall.

Total running weight.........................4882 lbs.
Wind resistance area of body..................unknown.
Consumption over 46 1/2 miles...................23 1/4 m.{Mr Moon / Mr Moore} per gl.{G. Linnett}
or 45.8 ton miles per gall.

Speed at 1000 r.p.m. on direct third gear. 37.88 m.p.h.

X983
  
  


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