When gas contains 10 percent ethanol how much ethanol is in a gallon of gas?

Answer 1

For every gallon of gas containing 10% ethanol (referred to as E10 gas), it will contain 1/10th gallon of ethanol (about 12 ounces by volume). Ethanol is primarily used to oxygenate the gas and replace the chemical MBTE, which pollutes groundwater. HOWEVER, since most ethanol in the US comes from corn, it is important to note that using ethanol in gasoline causes GREATER pollution than just gasoline alone. This is because it actually takes more energy to produce corn based ethanol than is extracted from it. Until better technologies for ethanol production are available (e.g. algae), it is best for the environment to avoid gas containing ethanol if possible (some states mandate it).

Answer 2

If a gallon of gas contains 10% ethanol, then there would be 0.1 x 1 = 0.1 gallons of ethanol in that gallon of gas. This is equivalent to 12.8 fluid ounces or approximately 3.785 liters.