By definition distillate fuel is classified as a No. 1, 2, or 3 fuel oil. In my KD engines I run No.1 fuel oil, aka 'kerosene', switching over from gasoline after the manifold gets hot. Some engine collectors believe kerosene produces more power than gasoline, but, I can't see any difference. I can barely remember KD tractors being used for farming, and they were older models. Some farmers preferred them in the '60's around here because they could buy kerosene for a nickle a gallon, opposed to 33 cents for gasoline. With the current fuel prices I can see no benefit as gasoline is now a little cheaper, but some of us occasionally run KD for nostalgia. Years ago when I was working on drilling rigs in the 'oil patch' of Texas, Louisiana, and Oklahoma, people would tell about using 'drip gas', which is also a natural occurring distillate, which was separated out from crude oil in the recovery process. I've seen tanks of 'drip gas' near producing wells, and was told it was a byproduct, which was often given away, or oil companies sometimes payed to have it disposed of. I understand that now drip gas is considered to be a useful product, as such it is sold. Older engines even some automobiles could run off of it, but smelled funny. Modern engines can't use it though.