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Chevrolet Sonic at the 2011 Detroit auto show

One of GM's numerous debuts at the 2011 Detroit auto show was this: the Chevrolet Sonic. Shown as a hatchback and four-door notchback, it's one of The General's weapons to tackle the now-globalised Ford Fiesta and its ilk. Good spot. That's because this is the US-spec Aveo - albeit shown in US-only notchback form as well as the more Euro-flavoured hatchback.

Mercedes-Benz S 600 V12 revealed at Detroit Motor Show

The Mercedes-Benz S-Class is unofficially known as the best car in the world… and the firm has now revealed the model that could make that title official – the new V12-engined long-wheelbase S 600 range-topper. Boasting a 530hp 6.0-litre biturbo V12, the new S 600 can accelerate from 0-62mph in just 4.6 seconds… but, thanks to ECO stop/start, it can also average over 25mpg, a 21% improvement on the old car. Just as importantly, it also promises an unparalleled luxury car experience.

Audi A3 Concept (2011): first pictures

Audi has released first sketches of the Audi A3 concept, ahead of its debut at the 2011 Geneva motor show. Audi is previewing the upcoming A3 with this saloon concept. It's powered by the fan-favourite five-cylinder turbocharged engine in 408bhp specification. Quattro four-wheel-drive and a seven-speed S-tronic double-clutch transmission complete the powertrain.  Sizewise, the new A3 saloon is 4440mm long, 1840mm wide and 1390mm high.  That's longer than the current A3 Sportback (4.3m) but shorter than the current VW Jetta saloon (4.64m). The new concept is slightly wider and lower than the current A3.