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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).
Comparing a Cadillac to a Bentley Mark V, detailing performance, fuel consumption, and temperature readings from a test run.

Identifier  ExFiles\Box 173\4\  img053
Date  8th November 1935
  
hotel Book-Cadillac Detroit
NATIONAL HOTEL MANAGEMENT CO., INC
RALPH HITZ PRESIDENT
Telephone Cadillac 7000
HOTELS NEW YORKER, LEXINGTON, NEW YORK, NETHERLAND PLAZA, CINCINNATI, RITZ-CARLTON, ATLANTIC CITY, VAN CLEVE, DAYTON

Sg.{Arthur F. Sidgreaves - MD} WOR{Arthur Wormald - General Works Manager} E By Hdly

We ran a Cadillac today - in some ways a revelation.

(1) By far the finest chassis in America and far better than a Bentley Mark V.{VIENNA} We sounded out J.{Mr Johnson W.M.} Murphy, mechanic of the car, where we found out a few facts. e.g. he said that he thought it should do no more m.p.g. on oil than the old car, which was about the same. The petrol consumption, which we filled, was 9.1 m.p.g. on a fast, normal American run.

(2) Fast run on concrete loop from post 3.00 to post 5.15 and up the cinder lane up to [illegible] and back to post 20 was what we were timed on. The time was 2m 30.7s. The oil temp. going up the hill was 95-97°C. The oil used was a very substantial oil, perhaps an S.A.E. 30 which is what they recommend in winter for this car. The water temp. never rose to 185°F i.e. 85°C. The air temperature was 76°F or probably around (25°C).
  
  


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