Does anyone know the difference between on-road diesel and off-road diesel? If I go to the gas station, I can only buy one kind of diesel fuel, but if I buy from a local oil company, I can buy either on-road diesel or off-road diesel, and of course it's less expensive, but you have to buy 100 gallons at a time. I'm guessing maybe it's not as refined? does anyone know? Does anyone use off-road diesel in their Kubotas?