Part four of Autocar's guide to the new cars of 2012 uncovers supercars and performance cars
New RS4 to share RS5's 444bhp V8, and won't be available as a saloon
Next Renault Laguna "possibly a crossover saloon"
New stop-start system to ensure 104g/km CO2 for 2.2-litre diesel Mazda 6
Concerns over coolant leak fires addressed; UK Volts and Amperas will be built with modifications
December registrations in; sales outstrip forecasts but are lower than in 2010
Lotus boss says selling the firm is a likely option for owner - once its launched several new cars
Part three of Autocar's guide to the new cars of 2012 examines hot hatches, coupés, executive cars
Toyota has revealed its 2012 facelifted Toyota Aygo city car, which will be at the Brussels show
Renault has revealed its 2012 revisions to its best-selling Mégane, featuring three new engines
We test Merc's stunning new SLS Roadster
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