1995 f-150 4.9L I6 drinks fuel!
I can get about 350Km out of a tank.

HELP!

 

how is the basic maintenance stuff like plugs and wires cap rotor and ignition timing? you have any leakage at the regulator? air and fuel filter? is it 4 wheel drive? my 94 300 2wd gets between 17 and 22 miles per gallon so about 300 miles on the small tank

 

well it looks like I have some work to do.
What order should I replace those parts?

 

how many miles are on the truck? If you haven't done any work then start with tune up and filters.