The auxiliary tank was my solution. Pulling a 43' fifth-wheel, it was always stressful wondering when the next stop would be and if I could find an easy in/out when driving in unfamiliar areas. We recently went from Dallas to Destin on "one tank" meaning we did not have to stop for fuel. We usually get about 9 mpg's when towing so with just the factory tank, it wasn't long after filling that I would begin to worry about the next stop. No stress now and can fill en-route with trailer attached at truck stops or continue to campground and fill truck tanks when disconnected when making trip un excess of 1000 miles. We have a comfortable 1000 mile towing range with the auxilliary tank when towing.