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First Sight: Citroën C4

 The Citroen C4 is a new car that shall be formally unveiled at the Paris Motor Show in September as the replacement for the Xsara that has been quietly competing in the European C-class for six years. The C4 was previewed in Geneva with the C4 Sport (a WRX themed concept car based very closely on the production 3-door C4) and less directly with the C6 Lignage Citroen concept car of Geneva 1999 which introduced many of the new car's exterior and interior design themes on a larger vehicle concept. Sitting between the C3 and C5 in Citroen's range, the C4 platform will also be shared by Citroen's partner Peugeot for the 307 replacement.

Infiniti Etherea: Infiniti’s compact concept revealed in Geneva

Infiniti Etherea Concept Despite our gripes that Infiniti seem half-hearted about their entry in to Europe – certainly in terms of their reluctance to get the product under people’s noses –  we can’t argue they’re not developing their range to suit the European market. Good case in point is the introduction of diesel lumps across the range, although we find the new Infiniti M35h Hybrid potentially more appealing than the M30d (we’ve surprised ourselves there). And now we get a proper European-sized concept revealed in Geneva – the Infiniti Etherea Concept – which is a compact, pillarless, suicide door endowed 3-Series competitor with a 2.5 litre S/C lump connected to an electric motor and driven through a CVT ‘box.

F1: New rules for 2011; 4-pot turbos for 2013

Turbo engines back in F1 in 2013. First turbo F1 - the Renault RS01 - pictured As anyone who keeps even the most casual of eyes on F1 knows, rules and regulations in the sport are there to be changed. And they are, with great frequency, as teams get better and better at exploiting current rules.