yea my Tahoe usually gets 18 to 19 mpg on the freeway. When i brought my 7x14 v-nose trailer home EMPTY i only got 10 to 11 mpgs. With 4 bikes and 4 dudes going to the gap this year i was only getting 7 to 9mpgs(depends on the hills). Couple trips i made to wayne sticking to 2 lanes(not the freeway) keeping it under 60mph i could still get 14mpgs loaded(2quads, fire wood, camping gear). I just bought a 6.5x14 open tandem axle trailer and got 15 to 16 mpgs on the freeway on the way home(unloaded). And 95% of my trailer use is freeway so fuel mileage is huge for me, plus you can do so much more with sa open trailer. Enclosed is nice to keep you shit clean and dry but not worth extra cash and hassle to maintain in my opinion.