We use Pure Gas, no ethenol.  We also add pure acetone, 2 oz. per 10 gallons.  I have improved my gas milage by 4 miles a gallon.  I read this on line, many months ago.   This works for us, but you might want to check it out for yourself.  Ethenol free gas cost about 10 cents more  a gallon.  Everyone puts it in thei...more