Hi HM
I have a 99 XLT, that has the 3.0L Vulcan engine.
Im averaging about 25hwy, and am trying to push that up to 30hwy.
I have a proposed mod thread here that might give you some ideas:
going for 30+mpg 3.0L ranger
look for posts by the user cons, he has an 04 with a 2.0L 4 cyl he is claiming to get over 40mpg with. he has heavily aero-modded his truck though.