My peugeot 508 diesel can do 1060km full tank (not driven 100% sensibly). My car has the same engine displacement and fuel tank capacity as the Kia, only difference is the weight, mine weight 1600kg, the Kia is 2100kg. Maybe u can expect it will do 850km. Diesel filter if u care about the common rail injectors and high pressure pump, change it every year. Or maybe even every 6 months if u do a lot of driving.