As I reported after driving from Chicago to Tampa and back, at an overall average speed of 54 mph, I got 14.3 mpg. I have now just over 5200 miles on the truck so you can probably figure 15 mpg to be a good conservative average for this engine based on the type of driving you are doing and the weight you are carrying.
Also, I did this trip without a bed cover and had the back seats fully filled with the seats up. I was able to stack everything we were carrying to just under the bottom lip of the back window, but had to slam the doors to get them to close sometimes (I had an ice chest and a small dresser along with boxes and softsided suitcases in there) as the load filled the width completely.
My wife is concerned about putting anything in the bed without a cover so I have yet to see the utility of having a truck.
