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s28drive with staggered wheels (245 front and 275 rear).
Without the Burger Tuning chip installed we get around 25.5-26.5mpg with 60% city. With it installed we get between 24-25mpg, 60% city.
On a road trip with factory wheels and tire sizes, we got right around 28mpg, 85% highway, plenty of throttle from cruise control. I think the EPA estimates for the AWD BMW's are always extremely optimistic, but on rwd models it seems to be correct.
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