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).
Conclusion on the performance and cost of Cable Tyres, comparing mileage against canvas tyres.
| Identifier | ExFiles\Box 1\7\ B001_X15 20 46 50 59-page140 | |
| Date | 1st September 1920 guessed | |
| -7- Cable Tyres. Consumption 4.28 gallons for 62 miles. Average speed 19.75 miles. CONCLUSION Briefly the Cable Tyre gives a better mileage than the canvas tyre, and once the first expense is made, gives it at an appreciably lower price. That is the great thing about this important question. Paradoxical as the assertion appears the tyre mileage tends to become cheaper in 1920 than in 1914. Unfortunately the petrol mileage and the oil mileage does not follow. - - - - - - - - - | ||