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Gold Lamborghini Aventador is the world's most expensive model car

You know that feeling when you think you've seen everything before? That sense that there's simply nothing left with the power to surprise. But then, without warning, along comes something else that takes your breath away.

Official: Mercedes SLS AMG Black Series

The new Mercedes-Benz SLS AMG Black Series has been revealed ahead of going on sale in the Summer of 2013. The SLS Black Series gets the usual mix for a Mercedes Black Series model – more power and less weight – and uses the same 6.2 litre V8 as the regular SLS but with the wick turned up to 622 horses from the regular, but hardly wanting, 583 thanks to a new air intake, cams, boost tweaks and better cooling. The oily tweaks for more power – and some weight shedding (70kg) – means the SLS Black can get to 62mph in 3.6 seconds – 0.2 seconds quicker than the regular SLS – and top out at 196mph (due to the extra downforce).

New vehicle labels to compare fuel economy, emissions with U.S. average

Window sticker labels will show how new vehicles' fuel economy and emissions levels compare with the U.S. fleet average starting in the 2013 model year, the Obama administration said Wednesday. The new federal rules carry out a 2007 law that requires labels to put new vehicles in fleetwide context for fuel economy, greenhouse gases and smog-forming pollutants.