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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).
Fuel consumption test data recorded during a hill climb up Snake Hill.

Identifier  ExFiles\Box 147\5\  scan0003
Date  10th August 1906
  
[Top Right] 3800
No4 T.T. 26350B. Consumption up Snake Hill
27 tooth pinion. Glossop side
Taken by C Platford 10/8/06 X459
Total weight with passengers etc. 2736 lbs.
From sharp corner after passing cottage on left to Danger post on top 2.9 to 3 miles (by speedometer) about 1 in 15.
3rd gear (1 1/2 mins on 2nd gear when down to 15. m per h)
(Strikethrough: 18 to 20 m per hr)
500 revs. of engine. full throttle.
① Max t. reached 90°. time 8m.8s petrol 1.38 pints
2nd gear 25 m per hr full throttle. time max t. Petrol.
engine speed. 950. - 6m.21s 90° 1.5 pints
(Side note: started @ 80° before starting)
15.9 m per h.{Arthur M. Hanbury - Head Complaints} throttled. engine speed 600. 6m.37s 93° 1.5
non stop engine speed 600. - 10m.45s 80° 1.32.
1st gear 19.2 m per h.{Arthur M. Hanbury - Head Complaints} engine speed 1200 - 8m.40s 80° 1.93
  
  


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