Oxygenated and Alcohol Fuels

Oxygenated fuels contain oxygen in their chemical structure. The advantages that oxygenated fuels offer are improved octane quality, better combustion, and reduced carbon monoxide emissions. The most commonly used oxygenated fuels are ethanol (grain alcohol) and MTBE (Methyl Tertiary Butyl Ether). Ethanol is acceptable if it does not exceed 10% by volume. MTBE is permitted up to 15% by volume. Another type of fuel oxygenator is Methanol, which is permitted up to 5% by volume.

NOTE: Exceeding 5% by volume of Methanol can damage the vehicle's fuel system due to its corrosive nature.