Best hwy range I've ever seen is over 575 miles. I remove the staggered wheels (I have a "for towing/hwy set of 255-19s B'stones, 38 psi), no speeds over 75mph, no AC, windows/sunroof closed. 1100 mile trips between houses in Coppell, TX & Spring Hill, FL with one gas stop. I pull into the FL house garage with 60 miles to "E" showing on OBC.

The sweet spot for MPG with the 4.4 M62 seems to be under 75mph, do 80mph and expect to loose 100 miles in range.

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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!