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Well not too much help but i drive my 2015 328d like i stole it. with that said my mpg's are not the best. the car was all stock except the 20x11 rear and 20x9or10 fronts. with that i was getting 28mpg. I had computer flashed by mission performance and then i deleted scr,egr,dpf and now im at 33mpg with a lot more hp and fun. most of my driving is city, not much highway.
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