Posts: 3480
Location: Elk River, Minnesota | Hiya,
Doing a quick search, E10 can hold up to .5% water (the alcohol absorbs it up to .5%).
This would mean a gallon of E10 can hold .005 gal of water, or about .64 ounces of water (a touch over a tablespoon). On a 10 gallon tank, this would be 6.4 ounces of water which to give some perspective to it, is just under one cup of water, or a touch over 4 shot glasses full of water.
To be honest...that is a LOT of water being absorbed. Anything above the .5% and the fuel will show separation as the alcohol bonds better with water than it does with gasoline, and will continue to absorb water. But...this is a lot of water....a LOT
Not going to make any argument one way or another, but i would think even in the most extreme situation of humidity, gaining an ounce of water in a tank that holds even 6 gallons will not be affected as it is run through the engine...
I will continue to run both, but I do think after some more research that going E10 might be the safest method as 91 octane can and may very well sit for a long period of time in a tank...and...I would assume the pick up line for the pump at the station is drawing from the bottom of the tank as well, where if the fuel sits for a long period of time could get quite a few contaminants in it...water included. Thus...being pumped right into your own tank.
Something to maybe think about a bit...
Steve
Edited by VMS 2/25/2019 4:06 PM
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