Did the front/rear diff fluid change (Royal Purple 75-90) & TC chain swap with double fill (workbench fill, 1qt) of mineral base ATF (50 mile hwy drive to flush the case). Drained and filled to correct level (.5qt) with Mobil 1 Syn ATF.

Saw an improvement in MPG. Driving a full tank over the past 2 weeks (Coppell, Southlake, Plano area), with temps over 100deg F and the AC running, got to 418 miles traveled before the distance to "E" display read "0".

Gotta love V8 power, ice cold air and non-hwy cruising at almost 18mpg.

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'03 X5 4.4 Sport, last of the M62s (8-03 build date)
I believe in deadication to craftmanship in a world of mediocrity!