I was just wondering if anyone has heard about this. And is it safe to use in diesel engins. somewon told me that it hardly has any fumes, and won't smoke. I recently called a local delivery service and they said that they would deliver it for 92 cents per gallon. I don't know if it is for on road use or not. I was planning to run it in a tractor. It is also made from miterials just from the us.