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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).
Road test log detailing a journey from Besancon to Paris, with timings, distances, fuel consumption, and speed analysis.

Identifier  ExFiles\Box 19\1\  Scan156
Date  9th December 1931 guessed
  
-2-
(Handwritten on left margin)
68 L of narrow winding cross country road in the rain.

........
December the 6th:

Left BESANCON 14h.02 II.440 -0 } 24 m.{Mr Moon / Mr Moore} Petrol 47 l.
14h.32 24 }

COMBEAUFONtne 15h.02 47 } 23 m.{Mr Moon / Mr Moore}
15h.32 66 } 19 m.{Mr Moon / Mr Moore}
rently correct
16h.02 85 } 19 m.{Mr Moon / Mr Moore}

Stop at DAMBLAIN 50' . . . . . . . . . . . Petrol 65 l.

JOIGNY 19h.43 } e m 222 m.{Mr Moon / Mr Moore} Petrol 85 l.
(Vertical text next to bracket: m i l e s)

222 m.{Mr Moon / Mr Moore} in 4h.53' - average speed 45m.6 - 73 Kms 8

JOIGNY 21h.33 } 222 m.{Mr Moon / Mr Moore} } 52 m.{Mr Moon / Mr Moore}
Obélisque of FONTAINEBLEAU 22h.33 } 274 m.{Mr Moon / Mr Moore} }
PARIS 23h.31 } II.757 - 316 m.{Mr Moon / Mr Moore} Petrol left.....30 l.
(Porte St-Cloud)

94 m.{Mr Moon / Mr Moore} in 1h.58 - average 48 m.{Mr Moon / Mr Moore}

Petrol consumption : 147 lit. in 316 miles(512 km.) 28 lit.6per % kms.

Oil consumption : approximately I lit.for 970 Kms.

The whole of the Sunday afternoon's run took place in heavy rain, and also during the night from 18 h.30 on wards.

---------

Maximum speed by speedometer 90 miles 145 Kms.

Maximum speed obtained at the highest burst: 95 miles - 155 Kms.

At 81 miles the speedometer registered I km. every 30 secondes.

The speedometer needle reads 10% fast - The totalisator is apparently correct.

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