All I've seen so far is this ...
EPA mileage estimates for 2011 models had not been released in time for this review. But a four-cylinder engine, as well as possible diesel power, should help the 2011 BMW X3 match or exceed fuel-economy ratings for the outgoing model -- even though it’s likely to be larger and heavier.
The 2010 X3 was rated at 17/24 mpg (city/highway) with either manual or automatic transmission. A four-cylinder or diesel X3 could be expected to beat that rating, while a 300-horsepower turbo-six model might not.
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