Granted you have a diesel and lot better mileage, but having that extra fuel on a long trip sure feels good when everyone else starts getting worried about getting off the trail. I have an auxillary tank in my yota and I love the fact that I still have 3/4's of a tank when everyone else is sucking fumes. Now my Willys, about 250 hp V6 with a Holley 4bbl and a 10 gal. tank, I get worried after I climb over the 1st rock.