Mercedes' F700 Concept is an interesting look at how fuel efficiency will impact this auto show season. Sure, lots of companies are bringing out small little hybrids, plug-ins and other gas-sipping concepts, but Mercedes thinks there's also a market for affluent greenies. The F700 isn't a hybrid, though — it uses a super-efficient four-cylinder engine with a prototype powertrain that moves like a V-6 but gets a dreamy 44.3 mpg.
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