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29Mazda returning to top-tier racing with diesel-powered prototype in USCC

Mazda has unveiled its latest challenger in the top flight of endurance racing, a diesel-powered prototype that will campaign the inaugural, 2014 Tudor United SportsCar Championship. The new Skyactiv-D-powered car will make its race debut at January's Rolex 24 at Daytona.

12Mazda Skyactiv-D racer first diesel to run at Indy in 60 years

While it may not be touting the old "Win on Sunday, sell on Monday" axiom we all know and love, Mazda recognizes that racing can only improve its cars. And so it's no surprise that the Japanese automaker is testing and refining its Skyactiv-D diesel engine by sending it out on various race tracks around the country – notably being the first diesel ever to compete at Daytona and the first to notch a Grand Am win at Road Atlanta.

22Diesel-powered Mazda6 going racing in Grand-Am Series

The diesel version of the 2014 Mazda6 won't be hitting North American showrooms until the middle of next year, but we won't have to wait that long to see the car in action. Mazda will enter its midsize sedan in the new Grand-Am GX class with a Skyactiv-D clean diesel engine under the hood, and the car will make its racing debut at the Rolex 24 at Daytona on January 26. This will be the first time in the race's 60-year history that a diesel-powered car has competed in the 24-hour race.

AddMore details on the 2011 Le Mans technical regulations, now with hybrid power

Peugeot 908-HY hybrid prototype – Click above for high-res image gallery

14More details on the 2011 Le Mans technical regulations, now with hybrid power

Peugeot 908-HY hybrid prototype – Click above for high-res image gallery

8Peugeot to run a pair of diesel RCZ coupes at 24 Hrs of Nürburgring

Peugeot RCZ racer – Click above for high-res image gallery

AddPeugeot to run pair of diesel RCZ coupes at 24 Hrs of Nurburgring

Peugeot RCZ racer – Click above for high-res image gallery

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