Punctilious just means that its stated purity is highly accurate. That said, however, most industrial alcohols are denatured, meaning that they have added methanol, or other toxic shit to prevent people from drinking it. During prohibition, the government required denaturants, even if it wasn't labeled as such. So basically thousands of people died because governments government. You could burn it in your car. If you have a supply of non-ethanol gasoline nearby you can add 1 too 1.5 gallons of it for every 10 of gas. Edit: one last thought. The old moonshiner way of testing for methanol contamination (methanol contamination is what could cause people to lose their sight from bad batches) is to light a spoonful on fire. If the flame is invisible or blue, you have pure ethanol. If it burns with a yellow or orange tip, it's contaminated. In not sure if bet my life on that test though. Acetone and other solvents can also be used to denature.