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Mazda brings diesel back to Indy with 6 Skyactiv-D

Diesel has enjoyed great success lately as a racing fuel, but there's one place it hasn't appeared for more than six decades: Indianapolis Motor Speedway. Mazda's breaking that dry spell this weekend, when its Mazda 6 Skyactiv-D race car will head to Indy for the Grand-Am race. We like the 6 in both road trim and racing livery, but that previous diesel-powered racer -- the Cummins Diesel Special -- is pretty neat too.

New Audi TT at Tokyo Show? Or could it be the Audi R4?

Audi R4 (left) or new Audi TT (right)? A few weeks ago Audi Blog in the Netherlands ran a sketch of what they thought was a new Audi TT. But it was a very basic sketch and, although interesting, we didn’t pursue it.

International Engine of the Year Awards to focus on fuel efficiency

Like the Oscars of the Otto cycle, the Grammys of gasoline, the International Engine of the Year Awards are a big deal in the industry. For 2013, the awards will continue to focus on green technology, pitting gasoline, compressed natural gas (CNG), hybrid and all-electric powerplants against each other for the title of "international engine of the year." Ford's 1.0-liter EcoBoost engine took top honors last year. Besides the top award, other categories include best green engine, best new engine and best performance engine, each voted on by journalists from around the world.