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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).
Series of graphs showing the effect of ignition advance, axle ratio, and engine temperature on petrol consumption.

Identifier  ExFiles\Box 178\1\  img060
Date  21th November 1925 guessed
  
EFFECT OF IGNITION ADVANCE
ON PETROL CONSUMPTION.
WATER TEMP. 80°C.
AXLE 15 x 52
SPEED 30 M.P.H.
TYRE PRESS 50 LBS/SQ."
MIXTURE CONTROL CENTRAL
TYRES. STANDARD.

Graph 1:
Title: IGNITION ADVANCE.
Y-Axis: PET. CONS. M.P.G.
X-Axis: IGNITION ADV. DEGREES BEFORE T.D.C.

EFFECT OF CHANGING FROM A
15 TOOTH TO A 17 TOOTH AXLE
ON PETROL CONSUMPTION
WATER TEMP. 80°C.
TYRE PRESS 60 LBS/SQ."
MIXTURE CENTRAL
TYRES STANDARD

Graph 2:
Title: AXLE RATIO.
Y-Axis: PET. CONS. M.P.G.
X-Axis: ROAD SPEED M.P.H.
Data lines: 15 x 52, 17 x 52, 3.06-1., 3.47-1.

EFFECT OF ENGINE TEMP.
ON CONSUMPTION.
AXLE 15 x 52
SPEED 30 M.P.H.
MIXTURE CONTROL. CENTRAL
TYRE PRESS 50 LBS/SQ."
TYRES STANDARD

Graph 3:
Title: COOLING WATER TEMP.
Y-Axis: PET. CONS. M.P.G.
X-Axis: TOP WATER TEMP. C°.
  
  


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