Ethanol test

Dave Wilson is a test engineer at Volvo Penta.  He recently sent me an email with the following information that I would like to share with you. Here's a quick check to ballpark how much ethanol is in your gasoline:   Get a 100mL graduated cylinder with some kind of cap.  Pour in 90mL of gasoline (make sure you shake it up first).  Pour in 10mL of water.  Shake vigorously for about a minute.  Let settle for several minutes.  View the reading on the graduated cylinder where it changes from water to gasoline, anything above 10 (original amount of water) is approximately the amount of ethanol In this picture it's 17mL, so 17-10=7% ethanol. It's kind of scary how easily water is absorbed into this fuel and the ethanol and water separate out from the gasoline.  Makes you wonder what's in the bottom of your tank!