If you guys are serious about testing for ethanol it's easy. All you need is a couple inches of water in a water bottle, draw a line around the bottle to mark the water level, fill the rest of the bottle with gas, put the lid on and shake it up, let it sit for a little while and the water and gas will separate. If the water line rises it has ethanol in it because the ethanol will separate from the gas and combine with the water. If the water level stays the same it is pure gas. If you are skeptical get some gas you know to have ethanol in it and give it a try.