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Originally Posted by Bimmer Loyalist
Does it really? It's heavier and it's got a bigger engine. I mean, the engine itself might be more efficient, but that doesn't mean the car itself will earn better mileage as a result.
The S5 doesn't surprise me. However, it'll receive the new TFSi V6 soon so those numbers should improve.
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I remember Tiff from Fifth Gear mentioning that it does have fuel savings over the E46.