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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).
Comparative fuel consumption tests between car models 19-EX and 25-EX.

Identifier  ExFiles\Box 13\4\  04-page024
Date  16th August 1932
  
87080.

To Hs.{Lord Ernest Hives - Chair} from GWH.{George W. Hancock - Head Chateauroux}    Hs{Lord Ernest Hives - Chair}/GWH.{George W. Hancock - Head Chateauroux}3/KT.16.8.32.

Comparative consumption tests taken with
19-EX, semo-expanding carburetter, 5.25 to 1
compression ratio, 12 X 41 axle ratio, 7" X 19"
wheels; and 25-EX, present standard carburetter,
11 X 41 axle ratio, 7" X 20" wheels, and 5 to 1
compression ratio.

The two cars ran together a distance of
112 miles. 19-EX with carburetter normal, 25-EX
half distance carburetter normal, remainder - control
two notches weak. High speeds, low speeds, accelerations,
were carried out during the run.

The amount of petrol used on each car
was identical, viz - 11 gallons, giving a consumption
of 10.18 m.p.g.

G.W.H.
  
  


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