E100 Explained

What is meant by E100 is, ethanol that is 100% oil free, not 100% alcohol... prohibition put the kabosh on 100% alcohol.  The alcohol for cars has between 3% and 7 % water in it for two reasons - first the law and second to promote heat transfer during the combustion process.  Take a look at the attached which is pretty complete - but in the first few paragraphs there is some information on hydrous and anhydrous ethanol.click here.: