30 mpg should not be a problem. Up and down the east coast gets me 28+ consistently. Cross country a couple times got me close to that as an overall average. Western US legs were netting 31+ mpg. It's fun to drive, roomy, and gets good fuel consumption numbers.

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8/2011 X5 xDrive35d Sport, Black Sapphire Metallic, Black Nevada Leather, Fine Burr Walnut Trim
2/2001 M5, Jet Black, Exclusive Complete Black Walk Nappa Point Heritage Leather, Black Cubic Trim