What alternative fuel, commonly made from corn, can be used to power gasoline engines?

Ethanol is the correct alternative fuel that is commonly derived from corn and can be used to power gasoline engines. It functions as an alcohol fuel that can be blended with gasoline to enhance octane levels and reduce greenhouse gas emissions when burned. Ethanol's production from corn involves fermentation processes, where sugars in the corn are converted into ethanol.

In many regions, particularly in the United States, ethanol is blended into gasoline at various percentages, such as E10 (10% ethanol, 90% gasoline) and E85 (85% ethanol, 15% gasoline), making it widely accessible as a renewable fuel option. The use of ethanol promotes energy independence and supports agricultural economies.

Other alternatives, such as biodiesel, natural gas, and propane, are derived from different sources and are primarily used for other types of engines or applications. Biodiesel is made from vegetable oils or animal fats, natural gas is a fossil fuel, and propane is a byproduct of natural gas processing and petroleum refining. Ethanol's specific connection to corn and its compatibility with gasoline engines make it the most suitable choice for this question.