so im having some problems with my mileage. im getting 14-15 in town and 11-12 on the highway? im not slug in town and i usually set cruise at like 65-70 on the highway in 5 gear. im at about 2500 give or take a couple hundred rpm

stock 4.0 5 speed manual stock, tire size, ext cab 4x4.
i just changed the o2 censors (all) 3 cuz i it was reading rich and lean o2s and still gettin the check engine light.

also i think the drums in the rear are rubbing a bit but im going to fix that (any advise?) but i think that all the factors im dealing with

help me