If you have an auto don't forget to service it, they have a tendency to get forgotten. The new ULSD fuel has sort of low lubricity compared with the old stuff, I run a biodiesel blend to make up for the lubricity. Pure bio can cause problems with fuel lines and cleaning out your fuel system (plugging the fuel filter) but a little bit doesn't seem to hurt, and it doesn't take much to bump the lubricity WAY up. 2stroke oil works, too, but is MUCH more expensive. Probably doesn't make too much difference, but it makes ME feel a little better!
Heh heh, love the efficiency! I only get about 18-19 in my Dodge (sorry guys), but that's on six 35's and I meet skepticism regularly! Even with prices on diesel higher, you STILL are better off for the approximately 50% increase in fuel economy afforded by the diesel engine. Congratulations, you are gonna love that truck. Stuff will break/wear out, but those mechanical IDI's seem last forever if you take care of them.
Oh, and a popular mod is to toss the glow plug controller for a switch so they don't constantly cycle 'till the engine warms up. The toggle glow setup makes the plugs last a lot longer, and in turn makes your $tarter last longer if the plugs crap out! Smokes a bit more 'till it's warm, though.