I would say that with your list of mods (adding in full synthetics all the way around like has been suggested) it should be pretty doable. If most of your commute is highway anyway. Stop and go is going to eat into the mileage of any heavy 4x4.
If you don't mind the ride of load range C or E tires, you can bump the tire pressure up pretty significantly during the summer months...plus they last a lot longer to boot. In my experience, P rated tires should be avoided on pretty much any truck...except maybe 4 banger s10/ranger/Toyota's that are never going to get loaded up or pull a trailer.
Consider buying the beater Civic first? Would save you a bundle of cash over commuting in the truck, even if gas stays around $2/gallon.
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