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Originally Posted by Fredo
What kind of improvement did you see at that mileage from the consumption at 1000 miles?
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It wasn't a sudden increase, but rather gradual.
In the US, the X3 was officially given window sticker numbers of 17 mpg urban and 23 mpg highway. (All of these figures are US mpg). In the beginning, our X3 was getting around 14-15 urban and about 20 on the freeway. By 10k miles, it was about 25% better overall.
Today, with 56,8k miles on the clock, urban is about 18 and freeway is easily 28 miles to the gallon. The biggest improvement is obviously the extra-urban driving, since it takes a lot of fuel to get 2+ tons moving!