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Customers less satisfied with run-flat, low-rolling resistance tires

In non-April Fool's news, customers who buy cars shod with run-flat tires are nearly twice as likely to have to replace them as people with more conventional tires, according to a J.D. Power and Associates study. The poll also found that customers are also less satisfied with low-rolling resistance tires.

Modified supercars at SEMA 2013 in pictures

The SEMA tuning and modified car show held in that centre of American excess, Las Vegas, is a melting pot for all things automotive. From trucks and busses to family saloons and hatchbacks, aftermarket tuning companies go to work making the wackiest modified versions of every type of vehicle around, showing off their wares at SEMA. Not even supercars are off limits.

Mercedes-Benz B-Class aerodynamics tested [w/video]

Mercedes-Benz has produced a video testing the aerodynamics of its new B-Class – which it claims is the most aerodynamically efficient car in the world – using a wind tunnel and fluorescent paint. The W245-generation B-Class has the lowest aerodynamic drag in its segment with a Cd of just 0.26, thanks to features such as serrated front wheel arch spoilers, optimized cooling airflow and a Pagoda roof to help airflow over its profile. The car's aero properties were put to the test at the MIRA vehicle test facility in the UK using fluorescent paint in 60mph winds to highlight its flow dynamics, only visible under UV lights.