Rolls-Royce Archives
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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).
Test report summary detailing mileage, fuel consumption, and tyre performance.

Identifier  ExFiles\Box 11\2\  02-page071
Date  21th January 1929 guessed
  
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Total Mileage of Car: 9.000
Average Petrol Consumption during the test: 10.58 M.P.H.
Total weight of car complete with body (No passengers): 2 tons. 4 cwt. 2 qts.
Dunlop Buttress tyres 32 x 6.75 fitted.
Tyre pressures: 40 lbs. front, 35 lbs. rear.
Average life of tyres during test:
Front: 9500.
Rear: 8000.

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