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      11-19-2012, 12:35 PM   #5
Enlisted Member

Drives: 2013 X3 x28i
Join Date: Sep 2012
Location: United States

Posts: 31
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For the non-imperial non-metric people, 40 mpg imperial is 33.3 mpg US gallons.

In the US, the X3 with 2.0 engine gets about 28 mpg on highways with gasoline. Given that diesel has about 20% energy than gas, that 33.3 diesel mpg is about right. (But the price of diesel in the US varies with season since it's similar to heating oil - diesel can sometimes cost about 10% more than gas, and is seldom priced less)