Yes they run fine on pakistani diesel but diesel shall be from reputed pump no sulfur or water in diesel
VNT Turbo D4D engines are powerful engines they produce more Hp than the older versions, but yeah there is a confusion about mileage, from what i heard & read D4D max gives 7-9 Km/Ltr in local & yeah may be 10-12 KM/Ltr on long depends on how you floor it