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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).
Using alcohol in the radiator, a speed comparison with a Cadillac, and the inaccuracy of American speedometers.

Identifier  ExFiles\Box 125\1\  scan0015
Date  18th July 1921
  
contd.

-2-

It is necessary to drain the alcohol out of this box and pour it back into the radiator. Unless alcohol is used in the radiator, it has no use whatever.

I do not think there is any doubt of not being able to equal the maximum speed of the Cadillac with a 14-tooth axle fitted to your car. You want, of course, to be certain that two much reliance is not placed on the speedometer fitted to the Cadillac. We have found that speedometers fitted to American cars invariably exaggerate the speed of the cars above 40 M.P.H.

Hs.{Lord Ernest Hives - Chair}
  
  


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