Some folks are writing off the diesel. The future, they say, lies in electric vehicles, with hybrids as the transition technology. Diesel fuel is expensive, they continue, and there is the further popular conception that diesels are not “clean.” In reality, a diesel typically shaves 30 percent off fuel consumption, and diesel fuel savings are even more substantial at high speeds. New technologies make burning diesel clean as—if not cleaner than—gasoline combustion.
On the road, few cars can keep up; Audi says the 0-to-62-mph sprint takes just 5.5 seconds and—more impressive—112 mph is achieved in 15.7 seconds. These figures, which we couldn’t verify with test equipment, seem absolutely credible. Power is instantly available. Push the throttle, and you get treated to an evil growl as the Q7 lurches forward. We were surprised at the sound level; Audi wants it that way, though, and in fact it’s almost completely designed into the exhaust system. The 6.0-liter V-12 works smoothly and quietly otherwise.
Source: Car and Driver