This bike has been out for quite a while, however the US marine Expeditionary Force keeps buying them up and none are making it to civilian hands, that I know of. I was told be a friend in the marines that they can run on multi fuels, Kerosene, gasoline, Diesel, Camping fuel etc including biodiesel.
I cant verify this other then this is what I was told, and I did read on a webpage it was a multi fuel bike and this listed gas, diesel and kerosene as "some" of the fuel options. It would also be my guess that your fuel range would reflect your choice of fuel. I would also question Fuel Filters and Fuel Pumps such as sulphur free diesel etc. My other concern would be can fuel be mixed int he tank, or would one need to empty the tank before changing the fuel, so the timing was able to adjust to the fuel.
I did read on diesel it was making something like 8OMPG or something and was said about increased mileage in the future developments.
Hope this helps, When I get home i can look into the links and see if any are still active, as I got them liker a year ago or so.