When I bought my flatbed dually truck I ran out of gas on the way home with it .I had a 5 gal can of gas with me that I dumped in to get me to the next station .When I got to the station it only took a few gallons to fill it up completely and the next day I ran out again even though it still had half a tank of gas .I went to the bodyshop that has my 72 1/2 ton and got the new tank and sending unit and installed it in the dually and it still will only run out half a tank and run out of gas even though it has a half tank. Any ideas what Im missing here ? The truck runs great otherwise ,just a weird situation.