Dakzuki wrote:
In fact ethanol blended gas has some advantages. The days of rusted out fuel tanks and corrosion within the the fuel system have largely gone. Water goes into solution with alcohol and goes right through your fuel system as part of that solution.
Yes but just 1 or 2 percent (What Amoco/Standard used to call "De-Icer" in the winter here in the great frozen North) is all it takes to do that, e-5 is too much for that.
There is evidence that if you have run E-0 (no booze in tank) for a while there may be varnish build up and such on the fuel system, and then you put in e-10 or more and the varnish may be dissolved, flake off and do bad things to injectors, metering jets and the like.
I do not think that modern vehicles designed for E-10 or E-15 or better yet e-85 which have never had E-0 in the tank have this problem... I also do not know that they do not (In short I do not know).
Mercury Outboards (To distinguish from the Mercury/Ford company) did some tests with E-15, They ran a bunch of motors 300 hours as I recall (may be off on the time) half on E-0 half on E-15, save for the one running E-15 that failed before the test was done.
They then tore them down and analyzed the wear and tear.
All the engines with E-15 had serious wear and tear issues the E-0 engines did not..
Now many argue "That was E-15" and they are right, but if it's happening at 15% you can bet it's happening at 10. UNLESS THE ENGINE IS DESIGNED FOR IT. And then, see "I do not know" above.