Run B20 in all of ours, even run it in the Kubota in our ZTR. 

It does gel easier than regular diesel, and from my experience if you happen to have a leak, it seems to eat paint and  and if its dripping on a heater hose, it will turn that hose to mush sooner or later, or it could be they just don't make hoses near as good as they used too. The higher dollar multi-fuel hose seems to hold up better.