Dylandog,
Pre-facelift as in 2003 or earlier. In 04 the new 4.4 (actually 4.5) engine went in and the front of the car changed. At first glance only the facia below the headlamps and the angel eyes are changed, in fact the front fenders and hood are different and contribute to a better airflow, add to that a more efficient 315hp engine and a 6sp auto transmission. It actually gets better EPA highway mileage than the 3.0

If I drive only short runs, in sport mode and drive very agressively then I will get down to 15 mpg (eg drive like my mom did) If I drive like my friend the MB dealer I can get 23.

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07 X5 E70 4.8i
04 Z4 E85 3.0