I just had my Pajero FM (2000 model) calibrated more than a month ago (replaced all injection tips plus the fuel pump assembly). Cold start up was gone and so did the black smoke emitting from the muffler. But it seems gas consumption is still quite high.

I always thought it was due to a faulty fuel gauge but after filling up my tank and computing my consumption, it seems I'm just doing 4-5km/l. I just had my tune up about 4 mos. ago and part of it was replacing the fuel, oil and air filters. Is it possible that these are already due for replacement?
Check / replace air filter...

Any other things you recommend I look into as well? If fuel system was properly calibrated, problem could be engine related. Check timing...

Majority of those I researched are on the above.

Thanks!