Arias Pistons 12.5:1 Compression 82mm Bore Honda B-series on 2040-parts.com

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.

CAR Most Wanted of 2014: Audi TT

By the CAR editorial team First Official Pictures 08 January 2014 10:30 The Audi TT is Audi's 911. Okay, it’s 15-years-old rather than 50, but it’s the sports car that made the Audi of today. And the all-new, third-generation TT wants to challenge the 911 like never before, with sharper dynamics and more performance, especially in 380bhp TT RS form.

2013 Audi A3 sketches revealed

2013 Audi A3 Hatch - there's also a saloon in the gallery below We’ve already had something of a glimpse of part of the next generation Audi A3 with the reveal at Geneva last month of the Audi A3 Concept. That Audi A3 Concept – which came complete with 400bhp and a boot – was really a look at the next generation RS3 in saloon guise – an Audi A3 that will go down a storm in an America quickly realising the joys of something smaller and swift. But now, for whatever reason, Audi has decided to release sketches of the 2013 Audi A3 in both saloon and hatchback form, together with a single sketch of the interior.