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Koenigsegg's craziest supercar yet debuts at Geneva

Here's what you need to know about the Koenigsegg One:1. It weighs 1,360 kilograms; it produces 1,360 hp. One horsepower per kilogram, which is why mad scientist Christian Von Koenigsegg is absolutely justified in bragging about it: it's the world's first "mega car," he said.

Renault Twin'Run concept

The Renault Twin'Run concept, unveiled during the weekend's Monaco Grand Prix, is the sibling of the Twin'Z collaboration with Ross Lovegrove. Together they fulfill the ‘Play' stage of Renault's ongoing concept car lifecycle. While its overall form is very similar to the Twin'Z's (apologies for awkward punctuation on Renault's behalf), previewing the next-generation, rear-engined Twingo, the ‘Run is altogether racier than the more pragmatic – if no less flamboyant – ‘Z.

Tesla Model S: European price revealed

Tesla has announced prices and model availability for Europe of the Model S – it starts at €72,600 – but no UK prices until late 2013. The Tesla Model S is garnering some impressive reviews now it’s out in the wild in the US, but it’s still some way from landing in Europe. But at least Tesla has come up with price and spec details for Europe, even though RHD models for the UK still don’t have a number.