Originally Posted by T.Dot_E30
Is all your driving city driving?
your tank is 63L, reserve is 8L so if you tank up when your light comes on that's around 55L which works out to 13.75L/100km or 17.1MPG if you get 400km on a tank.
323i has a combined fuel economy of 20MPG (17MPG city and 26MPG highway).
so if you do mostly city driving you're in the right ballpark.
I do a combination of city and hwy driving and i get a little over 500 before my light comes on (which works out to 10.8L/100km or ~22MPG)