qd32 using too much fuel

[Matt Mc]

Hi, i own a 1998 qd32 navara, it is using 80L in 500klms on the highway. i have just installed new injectors and there is no change i changed the fuel filter reciently too. iv checked the bango filter it was spotless. it has 200,000klms on the truck, snorkle, 31" bighorns 2'' sus lift.
is there any other reasons for it to be using this much fuel? cheers