(c) While a journey from its base may justify an issue of rations, a vehicle must at the same time be fuelled for its return journey, and there is little control of the goods, if any, that it brings back. 5. The comparative lack of control of the long-distance ###hicle is of the more importance because it is a great consumer ### fuel and rubber. The tyres of a heavy 8-wheeler require a###out 25 times as much rubber as those of a light van and on the a###erage, owing to the much greater distances run, they last only a###out half or a third as long.