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How did you know the alternate source used corn?
That has been around for a few years. It is called ethanol. Some gas stations you will see sell ethanol 85. A lot of brands make cars for this, including Dodge, Chrysler, Jeep, Ford, Chevrolet, and GMC. Some brands have engines specifically made for ethanol 85. You will also see some cars that read flex-fuel on them.
Vegetable oil and corn fueled cars is nothing new, and has been a growing thing in the auto industry.