Well, filled up today after running my first dose of added oil. Been getting 14 to 15 so 14.5 average I guess. Todays fill up I got 16.5. Not using high dollar oil, just the Wally World 2 stroke out of the gallon jug at about 10 cents an ounce. Filled up a little while ago for 3.35 a gallon which, sad to say, is the cheapest I have bought diesel in a very long time.