2.5 liter

We were once told by an auto writer that "real car people" didn't want green cars. They wanted noise, and roaring engines, and squealing tires. Well, the triumph of diesel-powered race cars at the famed 24 Heures du Mans shows you can have both. The French carmaker Peugeot placed first and second at Le Mans with their 908 HDI TAP cars. The Audi R15 TDI, which had won last year, took third place in this year's contest. That's a clean sweep in the fastest, longest, most famous endurance race in the world. How did they do it? Better fuel economy! The higher gas mileage of the diesels meant they...