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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).
Table of results showing rolling resistance at various speed drops.

Identifier  ExFiles\Box 161\1\  scan0248
Date  1st December 1938
  
-4-

The following results were obtained -

For the speed drop MPH.
Rolling Resist. RT lbs/ton.
K.{Mr Kilner}

85 - 80.
34.25
.0019+

80 - 75
31.75
.00169

75 - 70
29.75
.00164

70 - 65
28.0
.00163

65 - 60
26.5
.00165

60 - 55
25.25
.001675

55 - 50
24.3
.001675

50 - 45
23.7
.00168

45 - 40
23.1
.00170

40 - 35
22.7
.001685

35 - 30
22.43
.00169

30 - 25
22.285
.00168

25 - 20
22.175
.00159

20 - 15
22.105
.00119+

+ Readings unreliable due to difficulty of measuring high speed deceleration, and effect of smallest wind variation at low speeds.

Front area 23.4 sq.ft.
Tyre pressures 45 lbs/in2
Weight as tested 5292 lbs. 2.36 tons.
  
  


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