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With my X1 s28i 2014, I can get 23mpg on hwy with A/C on, driving 80mph, and front wind.
I have gotten 30 mpg with only difference the wind in the back.
I've never seen a car that was so load dependant for good mpg.
I also got 42 mpg for 70 miles at 70 mph with no A/C, and wind in back once.
I think anything around 25mpg average would be great for a car of this power.
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