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

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.