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One Lap of the Web: Senna's sweet go-kart

-- Gran Turismo has always included some, uh, unique car choices for its video games. (Sure, the Patent-Motorwagen is significant, but hot-lapping the 1-hp horseless carriage in "Gran Turismo 4" wasn't exactly riveting, unless you used cheats.) So that's why Ayrton Senna's go-kart from the 1978 World Karting Championship should be interesting -- it's nowhere near as fast as his Lotus 97T, but it shows that "Gran Turismo" wasn't kidding when developers said they wanted fans to chart the entirety of Senna's life. Plus, if you make it go 352 mph you can finally stick it to Prost.

Cadillac ATS (2012) compact exec unveiled at Detroit show

Cadillac took the wraps off the new compact Caddy, the ATS, at an event on the eve of the 2012 Detroit auto show. The new Cadillac ATS is essentially a BMW 3-series rival meeting all the design and engineering criteria of the larger Cadillacs. Cadillac ATS: what's new The ATS is like a baby CTS - the Art and Science design credo has been upheld, with sharp creases and pressed body surfacing to give it the Cady look.

Hyundai, Kia retract mileage claims

Hyundai and Kia overstated the estimated fuel economy on more than 900,000 U.S. vehicles sold over the past two years and will compensate owners for the faulty claims, a newspaper reported. In addition, the South Korean partners will lower the fuel-economy estimates on most of their 2012 and 2013 models, the Detroit News said.