OP don't feel bad man I'm averaging 9.6 miles to the gallon (90% highway) I'm getting about 220-240 miles out of every 24 or so gallons (while half the time I'm towing a 4500lbs trailer) I'm not all to upset about it yea sure I wanna keep more benjys in my pocket every time I fill up but this truck isn't designed to be fuel consumption friendly. It's made more for the working class citizen, made to be used for what it's made to do not seat you inside in ultra comfort and fashion that's more Range Rover category. If You want MPG's then maybe a wagon w/ 3 row seating or something like a venza should be what you really want.
Just my .02
Just my .02