Dodge oil. Every fill-up over last 6 yrs less than $2/gal. But it's not the price, it's the little propane we use. Fill it once and top it off once per year. Use about 400gal/yr or less than$800. We use it for radiant heat and cooking. But to be fair we get a lot of sun through windows in winter and have wood stove we use frequently. Sent from my Pixel 2 using Tapatalk