Parts Master 125777 Front Disc Brake Rotor 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.

Selling in the Motor City: RM Auctions hawks muscle cars, classic sheetmetal and even a boat at Detroit event

The steering wheel in a 1960 Cadillac Eldorado Biarritz convertible is surprisingly thin. It's oversized and humongously circular, but still startlingly narrow considering it directs a very bargelike Caddy. Oh, and the seats are fairly comfortable.

2013 Mazda 6 from £19,595: Paris 2012

Prices for the 2013 Mazda6 have been revealed at the Paris Motor Show. Starts at £18.595 and on sale January 2013. The entry point for the new Mazda6 is the 143bhp 2.0 litre petrol in SE trim with a six-speed manual box which will set you back £18,595, rising to £28,045 for the top of the tree 2.2-litre 175ps Tourer Sport Auto Nav.