We are 4,700+miles into this trip from Tucson to Maine, now in Kalamazoo MI. Our 24' Nexus 24', E-350 is averaging 9.5. We do not tow anything but are fully loaded for our 2 Month/7,500 mile journey. I cruise at 57 to no more than 62. Last fill up at $3.84 set me back $175... Which is why the 57-62. Ya gotta love that 55 gallon tank.