For the past 32 years, fuel economy requirements for cars and trucks in the U.S. were stagnant. That all changed in December when President Bush put his signature on a new law that slowly raises gas mileage standards for cars and trucks by 40%, to an average of 35 mpg by 2020. As a result, carmakers will begin marching out a parade of new, advanced technologies to boost miles per gallon in their vehicles.

One of the most effective and feasible solutions may seem surprising to many U.S. drivers. But diesel-engine vehicles, especially in Europe, are on the rise, and could overtake hybrids as the darlings of the green car world. Bradley Berman, editor of HybridCars.com, spoke with Johannes-Joerg Rueger, vice-president of engineering for diesel systems for Robert Bosch in Farmington Hills, Mich., a leading manufacturer of diesel vehicle technologies.

Via: Business Week