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VW Beetle Dune at the Detroit auto show

Of all the production-leaning concept vehicles at the Detroit auto show, the Volkswagen Beetle Dune's the sort of flight of fancy nobody was looking for. Nissan's Sport Sedan heralds the look of the next Maxima, which will likely trickle down in some way to future Altimas, Sentras and Versas. It looks as if Nissan will put one of its techno-retro RWD IDx concepts into production.

2012 Audi A6 Avant gets less weight, more power

Audi has dropped the details of the 2012 A6 Avant wagon, and the numbers are enticing. Unfortunately, it won't be coming here for the foreseeable future, Audi of America says. Lightness is one of the keys for the new model.

Future Audis may time traffic lights for you

Here's a trick efficiency-chasing hypermilers have been using for years: spotting the cycles of stoplights from 100 to 200 yards out and letting the car coast up to the light just before it turns green, then carrying on without ever letting the car come to a complete stop. These hypermilers, along with professional truck drivers, do this because they know that accelerating from a standstill burns the greatest amount of fuel, and because letting a car coast up to the light with the automatic transmission downshifting by itself is easier on the transmission than stomping on the brakes right beneath the stoplight. Oh, and it's easier on the brake pads as well.