The economics of petroleum . CONSUMED BY AUTOMOTIVETRANSPORTATION Fig. 131.—Quantity and value of petroleumproducts consumed by automotive transpor-tation compared with the consumption by allother requirements in 1920. Table 115.—Puoduction of Cars, Trucks and Tractors in the United States BY Years, 1910-1920 (/« thousands) Year Passenger Cars * Trucks * Tractors 1910 181 6 1911 199 11 1912 356 22 1913 462 24 1914 544 25 1915 819 74 22 1916 1494 90 28 1917 1741 128 63 1918 926 227 135 1919 1658 316 175 1920 1883 322 200 * Data from National Automobile Chamber of Coiiiiner
The economics of petroleum . CONSUMED BY AUTOMOTIVETRANSPORTATION Fig. 131.—Quantity and value of petroleumproducts consumed by automotive transpor-tation compared with the consumption by allother requirements in 1920. Table 115.—Puoduction of Cars, Trucks and Tractors in the United States BY Years, 1910-1920 (/« thousands) Year Passenger Cars * Trucks * Tractors 1910 181 6 1911 199 11 1912 356 22 1913 462 24 1914 544 25 1915 819 74 22 1916 1494 90 28 1917 1741 128 63 1918 926 227 135 1919 1658 316 175 1920 1883 322 200 * Data from National Automobile Chamber of Coiiiinercc. 266 THE BEARING OF AUTOMOTIVE TRANSPORTATION. EFFECT UPON GASOLINE 267 The approach of passenger cars to a number representing the sat-uration point of the country does not therefore mean a hmitationto the whole field of automotive transportation. The growth oftruck haulage has no such saturation point. With a bountiful andcheap supply of fuel the motor truck can expand to a further degree,finally enlarging its scope of activity from the field which character-izes it at the present to a point of coordination with railway trans-portation which will make it an integral part of that countrj^widesystem. Tractors likewise occupy a field which is in its infancy. Mechan-ical tillage and mechanical work on the farm represent the onlysolution in sight for the growing food requirements of a large popu-lation and for the steady migration of labor from rural districts toindustrial centers. The aeroplane also is a type of automotivetransportation whose future would appear to be important shouldno limitation of fuel supply intervene. On the wh
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