Its true, with just hwy, I can get 21mpg consistently on the 4.8is. If its straight city driving, I'm looking around 11mpg with fast takeoffs. Its quite a range but when I let the OBC avg itself out, its about 18mpg. The N62 IS that more efficient than the older M62. Then again, probably having the 6th gear helps extend the fwy mileage a bit.

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2004 X5 4.8is - X-pipe! V1 hardwired, Invision DVD headrests, N62 Intermediate Levers Fixed! FOR SALE!!! Contact me if interested!

1999 LSB M Coupe - Heavily modified
2008 M5 Sepang/Portland - Bone stock
2010 Mini Cooper S Laurel Sport Edition #1/100
2002 525iTouring - Alpine/Beige