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well my X3 is rated at 19/26, mostly suburb driving (so not pure city but not highway...) and we are getting 21.4 MPG right now. My C63 which is rated 12/18 I get 15 MPG yearly average (usually closer to 14 in the summer and 16 in the winter). I think Turbo's will usually tend to be more towards the City numbers for "mixed" driving, seems like they can really fudge the EPA numbers when turbos are used. even on long highway stretches I have yet to see my X3 hit 26 mpg, always seems to cap out around 25 mpg (which is funny because the 26 number is actually an average of highway measurements meaning it tested between say 24 and 28 MPG, I think window stickers convey this).
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