Mine's listed in my sig. It is an auto with 3.73 and 33" tires. I get 11/12 mpg for mixed driving and a little over 14mpg for highway trips if I stay in OD and keep it at the speed limit.
Towing 4000 to 7000lbs on the highway it gets around 9mpg. More tha nenough power for that weight, even with the 3.73 axle. It pulls all the highway hills around here in WV in OD or 3rd doing 60/65mph.
ANd in my opinion the milreage on these engines is fine. You have to consider it's a 415cc engine in a 7000lb truck that makes 400lb-ft of torque at 2000rpm. Compare this engine to other gas engines in 3/4 and 1 ton pickups and you'll find it gets the same or better mileage than all the other engines out there from the other manufacturers and it still makes more torque than about all of them.
Take a look at the GM 6.0L and the Dudge 5.7L in their respective 3/4 ton trucks and you'll find even the 2v V10s like mine will easily smoke those two engines towing or unloaded and gets better mileage to boot!
The only other gas engine out there that gives it a run for the $$ is the GM 8.1 and the Ford 2-vale 6.8L gets much better mileage and keeps up with the 8.1L despite being about 20% smaller than GM's "big-block".
The new 3valve V10s are even better and only slightly worse mpg from what I hear.
As far as I'm concerned, if you want a gas towing engine in a HD pickup the Ford V10 wins hands down.