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Originally Posted by lkchris
Note also that the mileage was probably rated higher last year -- EPA changed their test procedures.
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This is the key here. The EPA changes have resulted in mileage ratings that resemble people's real world experience as opposed to those "pie in the sky" numbers that come from an unrealistic test loop. I'm willing to bet that people can routinely do better than the EPA number if they drive like they're trying to conserve fuel.
Quote:
Originally Posted by lkchris
It's also interesting that the C350 sedan is rated 29 mpg highway--a real testament to the futility of running small engines hard. They're cheaper, is the main thing.
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Definitely true about the bigger vs. smaller engine. But is the 2.5 cheaper? I know they're cheaper to buy, but I don't understand how they can be cheaper to build. They're both the same modular V6, the only real differences are in the bore/stroke resulting in increased displacement. It can't cost MB appreciably more to make a 3.5L than a 2.5L. I don't understand why they offer a smaller V6 in that case. They should just have one V6 and make the price difference based on other content.