i brought a 2003 dodge dakota ext cab 2wd 3.9 standard with 90000kms 1 month ago i do a more highway driving than city but i only seem to be getting 300kms to a tank max, is this about average for the truck?
the air filter, spark plugs, and oil, are all new?

 

What size tank do you have, Or how much does it cost to fill?

I got the 5.2L v8 and it costs me 70 bucks to go 400 kms, Thats filling up at 1.04 a litre.

 

check the catalytic converter. a clog will cut your mpgs.

 

every once in a while, give'r on the onramp right through the rev band. Clears out the carbon, check tire pressure, should say on the inside of the door what pressures to run. The CAT. could be clogged up which kills hp and mpg