I have an n20 328xi. My wife drove it for years getting about 27-29mpg combined highway and city. Now that I drive it, I'll get about 28 on a long highway road trip and am at about 21 overall. However, I think this is MUCH more about the fact that I almost always keep it in sport mode at higher RPMs and accelerate a lot more quickly pretty much always than is reasonably necessary.
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