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Mercedes SLS GT3 race car leaks early

The first photos of the new Mercedes SLS GT3 race car have leaked out onto the web ahead of the car's official unveiling in a few weeks time. It does indeed, and that huge rear wing does a lot to balance out the long, long nose of the SLS AMG. The big wing is matched to a monster diffuser, chunky front splitter, aero spats around the nose, deep side sills and a vented rear bumper.

Volkswagen XL1

This, remarkably, is the production version of the Volkswagen XL1, the most fuel-efficient production car in the world, a car we'll see in Geneva in a little over a week. Barely changed from the concept version shown at the Qatar motor show two years ago, the production XL1 is the first production result of VW's 1-liter project – to design a car that uses less than 1l/100km (282.5mpg imperial) – that started with the lozenge-shaped, tandem-seat 2003 1L and the later L1 of 2009. The XL1 actually beats that by sipping just 0.9 liters with CO2 emissions of 21g/km.

GM taps Opel designs for future Buicks in the U.S.

Even as General Motors explores the sale of Opel, it will tap its European unit as a source for future Buick sedans. For the past two years, GM has shared Opel vehicles and design with Saturn. Sources familiar with GM's plans say those products now will go to Buick.