I'm not a proponent of E10, much less E15. I think it's a waste of taxpayer money. I think it's cost many, many consumers a LOT of money due to their lack of knoledge on how to store it and how to get their equipment ready to use it without the ethanol dissolving fuel system parts and collecting moisture which causes corrosion.
That said, since I have learned the quirks on how to handle the stuff, I don't have any problem with E10, water, corrosion or other except in some of the old cars I have that have unpressurized fuel systems (carburetors/mechanical fuel injection). On hot underhood temperatures I have experienced some fuel percolation on hot restarts and in very hot underhood temperatures like slow moving traffic.
On the other hand, my fuel systems have stayed clean and free of gum and varnish since using the stuff. Carb/FI float bowls appears to be super clean.
Given a choice, I'd take the straight stuff but I don't have that choice as I write.
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