Mike, At each fill up, set the trip meter back to zero, then you will know that at least you should go 200 miles before needing more fuel. To be on the safe side, I always figure I am getting 10 miles per gallon, even though most of my Imperials with the 440 will do much better than that, at least on the open road. Bill/Imp, 68's Have two with black interiors with blue green seat belts.