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We’ve just revealed the contenders for the What Car? Car of the Year Awards 2012, and to celebrate, we’re offering one lucky reader a week in the current title holder, the Audi A1.

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Mazda says it has developed a brake-regeneration system that will boost fuel economy by as much as 10%.

Called i-Eloop, the system converts energy generated under braking into electricity, which is then used to power the stereo, climate control and other electrical components and ancillaries.

The energy is stored in a capacitor, which, Mazda says, can be regularly drained and recharged without…

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