No need to bash the OP for questioning the mileage of a V8 SUV - why shouldn't he expect to get approx. the rated mileage for this vehicle?

I get over 15 mpg, mostly city. And that's without trying - could do better if I babied it. You should have yours checked out - 10.3 is ridiculous unless you drive like a madman. Also, have you manually checked your MPG? I wouldn't necessarily trust the on board computer.

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2008 X5 4.8i, Jet Black, Tobacco Nevada leather & just about everything else (no vent. seats, no 3rd row)