Audi in with diesel and hybrids

Audi TT

(Credit: Candace Lombardi/CNET Networks)

We know Audi has the fastest diesel engine in the world, but does it also have the cleanest one?

Many car companies have been touting diesel engine technology as the short-term solution to fuel prices and environmental concerns. Others are making hybrids or ...

Source: http://news.com.com