After replacing the fuel filter, tranny filter, a new fram air hog filter, new MAP sensor, new vaccum lines, new plugs (Autolite 3923), new wires, and a can of seafoam. My milage went from 8-10mpg to 15.5mpg this trip!!!!! I still have yet to put synthetics in the axles so im hoping that that will help me gain at least .5mpg. Im excieted!!!!!!!!!!!!!!!!!11

 

Nice! Thats about what I've been getting since I got my truck a year ago. It peaked one time at 18.5 all highway @ 70 mph. It's gone down a little since I got the performance computer (but thats cause you can't install a performance computer and not have a heavier foot). Then I lost about .5 mpg when I got the bigger tires.

 

About a year ago i made an 80mile trip with a pool table and got 17mpg going 70 and i havent seen it that high till today.

 

Highest I ever got was 19.3MPG 65MPH average with AC. Never was able to replicate it, even without AC.

 

my friends 96 318 got over 20mpg when he drove to vegas from here in milwaukee, this of course was after all new fluids, new fuel pump, new AC compressor, a new cv-shaft (the old boot was ripped, and the fluid leaked it dry) and a full bed of stuff. I wouldn't doubt if he averaged 75mph the whole way either...

Before the fuel pump started dying, i got 17-19mpg with camping supplies for a week and a fully loaded 14ft boat (and heavy-a trailer...) and i'm a lead foot