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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).
Consumption tests comparing vehicles 21-G-IV and 18-G-IV, including fuel usage and performance on hills.

Identifier  ExFiles\Box 147\5\  scan0109
Date  1st May 1934
  
X459

1.5.34.

Consumption Tests with 21-G-IV and 18-G-IV.

Miles run - 112.
Average speed - 31.2 M.P.H.

21-G-IV S.V.R.R. carburetter.
Petrol 6.125 gallons.
Con. 18.28 M.P.G.

18-G-IV. R.R. carburetter.
Petrol 6 gallons.
Con. 18.66 M.P.G.

On hills 21-G-IV definitely gets away from 18-G-IV.

HS{Lord Ernest Hives - Chair}/GWH.{George W. Hancock - Head Chateauroux}
  
  


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