My car shows fuel at this level at 140-150km after filling up the tank, while driving in Lahore (with average speed between 40-60). I think it is ok, It also depends on they way you drive, I mean rapid acceleration will burn more fuel. I went to Islamabad from Lahore last month and I got 580km (39 liters fuel used) on a motorway on a full tank, including Islamabad city driving. I drove between 90-110kph.