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Bolt Gold Nissan GT-R sells for $187,100

The Bolt Gold Nissan GT-R, autographed by Olympic champion Usain Bolt, sold for $187,100 at an eBay auction. All proceeds will be donated to the Usain Bolt Foundation, which helps create educational and cultural opportunities for young people in Jamaica. More than 100 people competed for the other items crossing the block, including racing helmets, special driving suits and boots, which brought $6,091 more.

IDSA's 3D-printed car design contest gets underway

Aspiring designers have the chance to see their 3D-printed car designs launched down a miniature model of a ski jump and crash in the Launch Day 2013 competition due to take place at the 2013 IDSA conference, which runs from 21-24 August. Up to five designs can be entered for free until 12 August in the competition, organized by The Industrial Designers Society of America. All submissions will then be judged for both aesthetics and for "using unique attributes of 3D printing" which will whittle them down to just 10 designs that will be printed before the launch.

Mazda to use regen brakes to boost fuel economy 5 to 10 percent

Mazda is adding a fuel-saving technology that harnesses wasted brake energy in the redesigned Mazda6 sedan due early next year. The approach uses regenerative braking to convert kinetic energy into electricity that is stored in a capacitor. The car later taps that capacitor to power the fuel pump, lights, audio, air conditioning and transmission and engine control systems.