With the mileage that most of your vehicles get, I feel a little out of place saying I tow a travel trailer, but it is cheaper than staying in motels and eating out (besides staying in it is quite fun!) But, as you can imagine, the truck, she does burn some gas. I have modified my intake and exhaust on my F150, went to LT tires (65psi), installed a custom programmed chip, and removed the clutch fan and installed a electric fan. On a recent 1900 mile pull, I averaged 10.2 mpg, pulling a 27 ft travel trailer that weighs aprox. 5500 pounds loaded. I run about 60-62 mph most of the time. Where do you think I can gain some more MPG? Is there something worthwhile to do to the truck? Or has anyone tried any aero mods to trailers? My overall economy is quite good, I ride my bicycle to work, ride good mpg motorcycles when possible and my other car is a Focus wagon,that I have lightly modified to increase MPG. But though I don't use the truck often, boy! we burn some gas when we do....any ideas?