Wow Tex, you really are a noob.
Faux Noise.
E15- makes no difference to me, unless the price break isn't proportional to E10/E85. I'll keep running E10 or E15 in brutal winter temps, E85 in the heat of summer, and proportional blends inbetween.
BTW- I mistakenly filled the snowblower with E85 and you know what? The darn thing started just fine in the cold! I wasn't expecting that. The only thing I noticed was that I had to be slower opening the choke, and I couldn't open it that last notch. Otherwise it ran perfect.