I would not use E-85.
There are a couple reasons.
1) it makes water hang in suspension, which is NOT GOOD, you want water to fall out, and get caught in the water seperator
2) it will eat up components in your fuel system, many rubber parts do not do well with ethanol.
3) Ethanoal has less BTU's per gallon than Gasoline, in fact even considering the price of the ethanol, you pay MORE per BTU with ethanol than gasoline
4) Ethaonl has an octane rating of about 100 or better....Octane is NOT GOOD ina diesel...the lower the octane rating the better...stale gas is even better yet.