(http://media.il.edmunds-media.com/mazda/6/2014/ns/2014_mazda_6_f34_ns_113012_196.jpg) The 2014 Mazda 6 will become the first diesel-fueled car to race in the Rolex 24 endurance race at Daytona.
InsideLine
Yes !! I have also read on official site and various other automotive blogs that Mazda 6 is the foremost confirmed vehicle to take part in Rolex 24 Hour Race.
Here is the source link: http://www.autotransportdepot.com/blog/?p=139.