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Mercedes-Benz B-Class aerodynamics tested [w/video]

Mercedes-Benz has produced a video testing the aerodynamics of its new B-Class – which it claims is the most aerodynamically efficient car in the world – using a wind tunnel and fluorescent paint. The W245-generation B-Class has the lowest aerodynamic drag in its segment with a Cd of just 0.26, thanks to features such as serrated front wheel arch spoilers, optimized cooling airflow and a Pagoda roof to help airflow over its profile. The car's aero properties were put to the test at the MIRA vehicle test facility in the UK using fluorescent paint in 60mph winds to highlight its flow dynamics, only visible under UV lights.

NASCAR: Rule changes to be clarified

The 29th annual NASCAR Sprint Cup Series Media Tour opens on Monday in the Charlotte, N.C., area. It's a four-day smorgasbord of announcements, team-shop tours, optimistic predictions and the unveiling of new race-car paint schemes, team members and sponsorships. More than 150 writers, broadcasters and photographers will get a steady diet of claims such as “we're excited,” “we've been working harder than ever,” “we feel we've got everything in place” and “we can't wait to get started.” The tour will visit almost every team that plans to run the full series schedule in 2011, teams such as Earnhardt-Ganassi, Stewart-Haas, Penske, Michael Waltrip, Richard Childress, Kevin Buckler's TRG, Team Red Bull, Furniture Row, Richard Petty, Hendrick, Roush-Fenway and Joe Gibbs.

Porsche Carrera GT in Paul Walker crash had six owners in its cross-country life

Always Evolving's Porsche Carerra GT -- recognizable for its unusual red color and black wheels -- is a difficult car to drive for even professionals, with one top driver calling its handling “scary." Those of us at Autoweek who have driven the car will likely concur. Always Evolving, a car race and tuner store operated by CEO Roger Rodas, a financial consultant who became friends and business partners with actor Paul Walker at a racetrack, acquired the car last spring, and used it often at car shows and in promotional ads. Rodas was driving when the car crashed, killing him and passenger Walker in a California business park Saturday afternoon.