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Tips for saving fuel on road trips: What's real and what isn't

Gasoline costs are hovering near $4 a gallon this week, and drivers hitting the highway for the holiday weekend are looking for ways to save. In preparation for Memorial Day, the Consumer Federation of America has released a list of tips that will help you pinch pennies at the pump. Most of these are the same evergreen recommendations that pop up for every road-trip holiday, and some of them are getting a bit stale.

General Motors fires back at Volkswagen

General Motors issued a terse response this week to published comments by Volkswagen CEO Martin Winterkorn, who suggested to the German press that Opel could be sold to a Chinese competitor. Detroit-based GM called Winterkorn's comments “regrettable” and accused him of “fanning speculation.” Opel was nearly sold to Magna and Russian investors in the wake of GM's 2009 bankruptcy. But then-CEO Ed Whitacre and the corporate board reversed that decision, igniting controversy from German political and labor leaders who have long chafed under American oversight.

Smart FourJoy concept

The Smart FourJoy concept will preview next year's all-new four-seat model at the Frankfurt motor show. Unlike the ForFour (2004-06) that paid only lip service to the brand's iconic city car, this promises to be a true Smart, with the familiar Tridon safety shell, minimal overhangs and plastic panels. At 3,494mm long it's around a meter longer than the original two-seat version but still significantly shorter than a Mini.