That 25 still can't be right, even with the new methodology for figuring out the rating. My 2000 E320 4Matic Wagon gets 27 mpg on the highway in real world conditions, and that's with a 5 speed auto. If a C-class with a 7 speed can't do better than that with way less weight, there's something wrong here.

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Jonathan

2011 Mazda2
2000 E320 4Matic Wagon
1994 C280 (retired)