Not long from now, the idea of a luxury fuel-efficient vehicle will most probably become ubiquitous. As the US government slowly raises the Corporate Average Fuel Economy rating, in a 5 percent annual ramp up to 35.5 mpg by 2016), automakers will need to manufacture more fuel frugal cars and trucks. And that of course includes luxury cars. But luxury cars buyers don't want to sacrifice comfort, performance or technology to save at the pump-or to save the planet. Who says they have to? Here, we take two forward-looking, fuel-efficient vehicles-one, a hybrid; the other, a diesel-from Lexus and BMW for a 390-mile test ride.<br clear="both" style="clear: both;"/>
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