A diesel engine may run on vegetable oil , but it will not run on donuts . According to Gas Buddy .com , the current price of diesel oil is 2 .50 per gallon . Therefore , five gallons of diesel fuel will cost you about 12 .50 . When was the last time you were able to fill your tank for less than 20 ? Sources ( HYPERLINK "http /journeytoforever .org /biodiesel_svo .html " http /journeytoforever .org /biodiesel_svo .html HYPERLINK "http /en .wikipedia .org /wiki /Waste_vegetable_oil " http /en...











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