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Volvo’s KERS system improves performance and cuts fuel use.

The Volvo S60 with KERS Flywheel (pictured) boosts economy and performance As car makers continue to get bashed by more and more stringent CO2 targets from governments around the world, cleverer solutions are called for to squeeze the best performance and economy balance possible from their products. And Volvo’s new Flywheel KERS system does look promising. Volvo are currently running UK tests of a KERS flywheel system developed by Flybrid Automotive, which takes kinetic energy generated under braking and stores it in a flywheel fitted to the back axle.

Bentley Mulsanne Convertible (2012) first sketches

Bentley has dropped a strong hint that an open-top Mulsanne model is on the way. Almost three years to the day since the original Mulsanne limo made its debut at the Pebble Beach Concours d'Elegance, Crewe has released sketches of a soft-top Mulsanne, touted by Bentley as 'the ultimate in contemporary design, prestige and exclusivity'. Is the Bentley Mulsanne Convertible Concept just a new Azure?

Watch the Porsche 911 GT3 rear-steering system work

A handful of manufacturers have offered four-wheel steering in the past including Honda, Nissan, BMW, Mitsubishi, Mazda and, most recently, Acura and Porsche. On Monday, suspension expert Elephant Racing uploaded a video to its YouTube channel demonstrating the feature on the 2014 Porsche 911 GT3. In most four-wheel steering cars--Acura and Porsche included—a computer controls the movable rear wheels.