My neck of the woods is currently many degrees F sub-zero.
A buddy was worried about the diesel fuel gelling up on him.
I said "why not add 10% ethanol to keep it from freezing?".
He said "Can you do that?"

I said "I don't know, let's look it up on the web."
Turns out, you can!
Nebraska is testing ( has been testing since 2005 ) 15% ethanol mixed with #2 diesel in a fleet of busses. The article is here:
http://www.ne-ethanol.org/facts/ediesel.htm

"E diesel is a blend of diesel fuel, up to 15% ethanol, and one of several proprietary additives to keep the ethanol emulsified under all conditions. A number of on-road and off-road fleet demonstrations have shown E diesel has the potential to reduce emissions from diesel engines, especially particulate emissions."

EDiesel. Who knew?