From GM press: GM’s follow up to the iconic Y Job was the fabulous 1951 LeSabre. This “dream car” drew its design inspiration from the F86 jet fighter aircraft (note the narrow and rounded front and rear scoops) and was billed as an “experimental laboratory on wheels,” powered by a 215 cubic inch supercharged V-8 engine with two carburetors and fuel tanks.
One carburetor drew premium gasoline from the first tank when the car traveled at low or constant speed. When the driver accelerated, the second carburetor drew from the second tank, which was filled with methanol fuel. The LeSabre also featured air brakes and a convertible roof that would automatically close when activated by a rain sensor.