Original World War 2 business industry trade magazine vintage ad for GENERAL MOTORS of Detroit, MI.  How Many Miles in a Gallon of Gasoline?  Out of the need to save rubber, gasoline is rationed, necessarily in terms of gallons.  Let the GM dealer put and keep your car in most efficient condition, and show you how to handle it to stretch your regular ration. GM now producing aircraft engines, airplanes, airplane parts, bomber sub-assemblies, military trucks, armored cars, rapid fire cannon, machine guns, diesel engines, shells, tanks and tank parts, propellers, cartridge cases, gun motor carriages, gun mounts, fire control devices, electrical equipment, and many other wartime essentials.  Old 1943 WW2 era propaganda magazine advertisement.