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).
Comparative table of performance data for various motor cars.
| Identifier | ExFiles\Box 161\1\ scan0246 | |
| Date | 1st November 1938 guessed | |
| CAR. | TOTAL WT. 2 PASS'G'S. | WT. ON FRONT WH'LS. | MAX LAP SPEED. | ROAD WHEEL H.P. AT MAX. LAP SPEED. | H.P. TO DRIVE DYNO. DRUMS AT MAX. LAP SP{Mr Spinney}'D.{John DeLooze - Company Secretary} | FRONTAL AREA OF CAR. | CAR TYRE PRESSURES. | ROAD WHEEL HP. TO LAP AT 80 MPH. | K Assuming const. rolling resist. 30 lbs/ton. | K Using Andreau formula for roll. resist. | K Using Andreau formula for roll. resist. for RRA. | K Using Gen. Motors formula for roll. resist. | Tons. | Tons. | MPH. | H.P. | H.P. | SQ.FT. | lbs/in2 | H.P. | | | | | P.III. Close Coupled. | 2.7 | 1.2 | 91 | 120.0 | 3.9 | 28.8 | 35 | 84.5 | .002 | .00188 | .00186 | .00192 Wraith Close Coupled. | 2.05 | 0.95 | 74 | 61.0 | 1.93 | 27.2 | 35 | 79.7 | .00195 | .00191 | .00189 | .00191 B.III. | 1.84 | 0.9 | 87.2 | 84.5 | 3.3 | 24.06 | 35 | 68.0 | .00192 | .00184 | .00181 | .00184 Packard. | 1.72 | 0.8 | 81 | 67.7 | 2.6 | 26.4 | 35 | 68.0 | .00175 | .00168 | .00167 | .00165 Oldsmobile | 1.70 | 0.8 | 77 | 54.0 | 2.2 | 25.6 | 35 | 61.8 | .00165 | .00159 | .00158 | .00158 Ford V8 | 1.51 | 0.75 | 81.6 | 54.5 | 2.65 | 23.8 | 35 | 54.0 | .00152 | .00146 | .00144 | .00146 Paulin | 1.70 | 9.8 | 97+ | 84.5+ | 3.3 | 24.5 | 35 | 49.5 | .00137 | .00127 | .00120 | .00132 Buick 'Century' | 1.94 | 0.98 | 88.9 | 77.0 | 3.55 | 26 | 35 road. 45 dyno. | 58.8 | .00151 | .00138 | .00140 | .00144 Chrysler. | 1.75 | 0.85 | 76.7 | 47.5 | 2.2 | 26 | 35 road. 45 dyno. | 56.4 | .00142 | .00109 ? | .00108 ? | .00136. S.S. Jaguar | 1.75 | 0.85 | 84.8 | 71.5 | 3.1 | 24 | 35 | 63 | .00176 | .00168 | .00167 | .00169. Lincoln Zephyr (1938) | 1.83 | 0.94 | 80.6 | 72 | 2.6 | 26 | 28 road. 45 dyno. | 73 | .00189 | .00163 | .00162 | .00182. + Tentative figures. | ||