stock 2000 3.3l with 156000 miles on er highway tread tires 265/70/15s recent minor tune up (new plugs wires and fuel filter and distributor, due to failure not for tune up, and k&n drop in filter)
and fresh fluids (do not flush the tranny unless you know its been done before or the fluid isnt too dark as doing it after too long on old fluid could mess it up a drain and fill with new tranny filter would be more beneficial
i ran pennzoil hm oil 10w30 because a few leaks i had (recently fixed and changed to castrol gtx syn blend 5w30 and noticed a better response and seems like a lil bump in fuel economy, would use full synthetic but dont have the $)
new shocks and accessory belts done, service records show 105k mile tune up done at 117k so i think my timing belt was done and battery
i get about 15.5-17mpg average (depending on how much highway i drive that tank) but even before i did anything to it when i got it a year ago i was getting 14.8-16.7 (depending on highway driving amount) and one tank when i filled at half i got 21mpg best since was 18.4 on a 50% hwy 50% city and usual is between 15.5 and 17.2ish best thing i can recommend you do for this is REPLACE THE FUEL FILTER AND PCV VALVE! that plays a major role in our trucks mpg and power and dump a bottle of regular lucas (clear bottle brown liquid in it when you do that) may also try the diy seafoam in the diy section i used the brake booster vacuum line, here is a link:http://www.clubxterra.org/forums/showthread.php?t=18963
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