I haven't had mine long enough to give you any advice...
But they sure seem to be every bit as good, as anything that you've heard about them. Mine seems to be getting a bit over 15 mpg steadily. It drives beautifully, has all sorts of safety features that I'd be hard-pressed to defeat, and my Missus says that it drives just like a big van...
Just remember to keep a container of DEF in your garage, and you'll never have a problem.
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