Denatured alcohol is not safe to put in the gas tank of a vehicle. Denatured alcohol is ethanol that has been made unfit for human consumption by the addition of a denaturant, which is typically methanol, gasoline, or other toxic substances. Methanol is particularly harmful to engines and can cause damage to fuel systems, including fuel lines, fuel pumps, and fuel injectors. Additionally, denatured alcohol has a lower octane rating than gasoline, which means it can cause knocking and pinging in engines. In extreme cases, using denatured alcohol in a gas tank can lead to engine failure.
Therefore, it is important to use only gasoline or other approved fuels in vehicles, and to avoid using denatured alcohol or other non-approved fuels.
