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Volkswagen XL1

This, remarkably, is the production version of the Volkswagen XL1, the most fuel-efficient production car in the world, a car we'll see in Geneva in a little over a week. Barely changed from the concept version shown at the Qatar motor show two years ago, the production XL1 is the first production result of VW's 1-liter project – to design a car that uses less than 1l/100km (282.5mpg imperial) – that started with the lozenge-shaped, tandem-seat 2003 1L and the later L1 of 2009. The XL1 actually beats that by sipping just 0.9 liters with CO2 emissions of 21g/km.

Revealed: the cheapest and most expensive cars to fuel

Running a car can be an expensive business, with fuel a major contributing factor, especially if you happen to cover long distances. As we know, fuel isn’t cheap. Fortunately, independent car cost experts CAP constantly collect millions of pieces of data about thousands of new and used cars in the UK, helping to produce its Total Cost of Motoring analysis.

Toyota gunning for Honda Insight

We brought you news yesterday of the new Honda Insight, which Honda is launching in to the European market. Honda has made big noises about the Insight being significantly cheaper than the Prius, which seems to have got Toyota thinking. The next generation Toyota Prius (unveiled recently at Detroit) is due out before too long, and is a bigger, better equipped car than the outgoing version, and therefore more expensive.