The Mobilgas Economy Runs were held from 1950 to 1968. They showed the potential miles per gallon capabilities of new U. S. manufactured and designed automobiles and were a revival of the Gilmore Economy Runs, held from 1936 to 1941, after the merger of Gilmore Oil company with General Petroleum Corporation. This is the first complete history written on the Economy Runs and covers some aspects of the runs that were not reported at the time in many newspaper and magazine articles. Each year's event is presented in detail from the announcement of each year's routing, preparation, course/route descriptions, and actual competition, to final results and promotional activities. A separate chapter covers the Mobil Mileage Rally (for imported models) held from 1958 to 1961.