Oh I know the gas milage will suck, but I've driven a vehicle getting 8mpg for the last 2 years.
My thoughts are this, with the trade in, it would equal out to about $12,000 in debt for the truck. Finance it for 7 years to make the initial payments low, pay it off in 3-4 years. 22,000 miles, it'll run through about 180-200,000+ miles, last me a while.
This is just an idea that I've been playing with though.