My mistake on my previous post. I didn't quite do the conversion correctly. I meant 13 l/100km, or about 18,5 miles to the US gallon for urban driving.

18,5 l/100km is quite high for urban driving; it's about what the X5 4.8i drivers are getting actually! Answer the following:

1. How are ambient temperatures in the area? Are you running the air-conditioning freqently in urban driving?

2. What grade fuel are you using? Is it a high-quality fuel?

3. Are your tyre pressures checked and set correctly? The recommended pressures are 220 kPa minimum front & rear. Check pressure when cold/before your first drive of the day.

5.Do you have any additional weight in the trunk that you needlessly carry around?

If all these conditions are met properly, then you may have an issue with the vehicle ltself.