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Carlsson upgrades the Mercedes-Benz CLS63 AMG for the Geneva motor show

If supercars had a spiritual home all to themselves, it probably would be the Geneva motor show. This year we'll see the new Ferrari F12 Berlinetta, the Lamborghini Aventador Roadster and the Aston Martin V12 Zagato. But it's not only the home of production supercars; the tuning companies come out to show their wares as well.

2013 Toyota Auris: Price from £14,495

The new Toyota Auris is heading for a debut at Paris 2012 and Toyota has now revealed prie and specification ahead of its reval. Starting point will be £14,495 and there will be four trim grades - Active, Icon, Sport and Excel – as well as two petrol engines – 1.33 Dual VVT-i and 1.6 litre Valvematic – a single 1.4 litre D-4D diesel and a hybrid, with the diesel and petrols getting a six-speed manual ‘box and Toyota’s Multidrive S CVT an option on the 1.6 petrol. The Auris hybrid gets the E-CVT automatic.

MPG or performance: It's a trade with turbos

Some automakers say turbochargers offer high fuel economy and quick acceleration, the best of both worlds. Well, yes and no. Turbocharged vehicles allow automakers to keep power output high while they downsize engines for better fuel economy.