Gas Mileage Issues on my 04 X5 4.4L

[Greekthang]

So guys here is the dilemma,

As soon as my X5 hit the 100,000km mark it started giving crappy gas mileage. I gauge this because when I use to fill my

tank completely to the top keeping the same driving habits the first quarter tank (at the 3/4 mark) would yield me 200km

where as now it only yields me 170km.

I recently did an Inspection 2 and still nothing. I added a fuel cleaner to clean out the fuel system and still nothing.

Just recently changed an ignition coil that was misfiring still nothing.

Just wondering if there is anyone else with the same issues. I am running 94 octane.

Would the ignition coils need a changing maybe ?

Im at a loss here people

Thanks