well, with my 2006 FX4, (stock) i've gotten 22.5 MPG (all highway), realisticly i'm getting probably 19MPG combined. in the winter it drops to about 16MPG with warm-ups and all...
i hate to say it, but i'm looking at a honda too... even worse, it's piped up... okay, its a friends old ride, it's a '92 civic hatchback with the 1.7VTEC. it's got a mangnaflow cat back, a header (boy that just doesn't sound right "A header!"), an AEM short ram intake, and a full MSD ignition. so it's customized a bit, though it's pretty rough around the edges (a series of unfortunate events happend), it's red with a purple hood and a massive dent in the fender. i figure i'll get the hood painted, hammer the dent out of the fender, and maybe even repair the rust... oh well, it should get atleast 40MPG!
even with the price of fuel dropped as it has, i'll still be spending close to $2400 in fuel for the truck, so that will offset the purchase price of the car. not only that, the honda will be far cheaper to service!