The goo that was mentioned in a prior post is the result of phase separation,this happens when the Ethanol absorbs its maximum amount of moisture and separates from the gasoline and drops to the bottom of you gas tank because it is heavier.This Goo(which looks grey and consistency of like karo syrup) is picked up and the destruction begins. As stated most cars and trucks turn the fuel over quick enough the it doesn't affect them as badly.E15 will affect cars and trucks due to the ECM programing which will allow them to run on 10% ethanol by volume unless you own a vehicle designed for E85.When on winter blend gas you can test it as I am forced to do because of my occupation I have found this year winter blend containing up to 16% by volume.Hence poor performance,poor fuel economy and other driveability issues.Small engines or vehicle that sit for periods of time where the gas isn't going to be cycled through within 60 days you should be adding a product that prevent phase separation. My brand of choice is Startron,I have used it since 2004 and have never had an issue relating to fuel. On the water some marinas treat the fuel in their tanks so the work is done for you Like Channel/valvtech-Shep Browns/Startron etc. which ever you choose make absolutly it is designed and they stand behind it if it doent work.I cant stand watching parts people still selling red Stabil it is useless when you have E10 fuel. Just my 2 cents
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