Daytona 24 Hours

One of the more hotly-anticipated cars of this year is the diesel variant of Mazda's new 6 sedan. It's a striking car on the outside, but its efficient clean diesel engine should make it striking on the road too--with cleanliness and efficiency being key priorities. Efficiency is always a priority for race teams too, which is why Mazda fielded diesel race cars in the recent 24 Hours of Daytona. More amazingly, says SAE International, they raced on synthetic diesel. Synthetic oils have been around for decades, but the synthetic fuel used by the three racers was claimed to develop no smoke. No...