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BMW M4 Convertible revealed. Price from £60,730

The BMW M4 Convertible (pictured) revealed We reported last month that the new BMW M4 Convertible would debut at this year’s New York Auto Show, and here it is ahead of that debut complete with trick folding metal roof, 425bhp and a price tag that just nicks over the £60k line. A direct replacement for the old M3 Convertible, the M4 Convertible will cost you just over £4k more than the M4 Coupe, but for the extra money you get the same car but with infinite headroom – and a big weight penalty. The new 3-piece metal folding roof can be tucked away in a mere 20 seconds at the flick of a switch, with better noise insulation than the M3 Convertible had and more room in the boot when the roof is down too.

Volvo Flywheel KERS Hybrid cuts fuel consumption by 25%

Two years ago we reported that Volvo were testing a clever hybrid Flywheel KERS system for road cars and hoped it would prove to be a good way to make road cars more economical. And it seems it does. The Hybrid Flywheel KERS system Volvo has developed weighs only 6kg, has a diameter of just 20cm, is made of carbon fibre, sits in a vacuum and is located on the back axle and works by recovering energy under braking which is then stored for use when the car moves off.

BMW Pininfarina Gran Lusso Coupé revealed ahead of debut at 2013 Concorso d’Eleganza Villa d’Este

The BMW Gran Lusso Coupe by Pininfarina revealed ahead of Villa d’Este Or at least it still does if you expect the new 8 Series to look like a two-door version of the next generation 7 Series, rather than a completely individual model like the old 8 Series. Underpinning the Gran Lusso Coupe is the same platform the 7 Series uses and the same V12 from the 760i, which makes it both easier to bolt the Gran Lusso together and imagine it as future production model. The exterior of the Gran Lusso looks a bit like a coachbuilt version of a big BMW coupe, with most of the BMW design cues intact – if sharpened somewhat – with short overhangs and a long wheelbase.