Fuel is a killer. Things you can do to help that cost. I have been running Motorkote. Not quite using it like the directions say and gaining 1/2 to 3/4 mile a gallon. Yesterday getting fuel I did 6.6 Mpg. Now for me that is the best I have ever gotten and that was cruising 68 mph. Also anybody seen my rolling brick knows that is damn good. Tires. Been swapping the trailer to low rolling resistence tires. I have had 4 on before and saw an increase in mileage. Not a big jump but noticeable. After trying different tires to no avail going back to the michilins. My theory is this. If I got to rotate the tires due to wear in different poitions. I might as well put the best rolling tire and longest wearing tire I have ever had on the trailer. Last remaining is almost 4 years old. Also taking my lug tires off and going highway. My offroad is very minimal. Also if the trailer sinks along with the truck not going to dig deeper or tear something up. Most places I go have machinery. Also if it is that bad they can drive it in from the road. the 2 times I have been stuck deep lugs would not of made any difference. What I do for tires and different things may not work for you. So far gained upwards of 1 full mile a gallon and also with the different terrain,weight,drag and everything any increase is positive. Going for 1 tank less per load. at 700 or better per tank 1 tank per load adds up real fast. Although I do not need this to make ends meat. 20+k at the end of the year is nice