Diesels back.

Its been a two years that Audi USA has tried to get americans to go back to using diesel by selling its fuel efficiency. One of their major efforts came during the recent Superbowl, where Audi spend nearly 3 million dollars on a funny commercial that showed their diesel powered Q7 SUV as the consumer's answer to the "green police". The tactic seems to be paying off however, Audi buyer's now choose turbocharge direct injection, or TDI, in 40 % of their Q7s and about half of their A3 compact sedans. That more than doubled Audi's diesel sale expectations.
Americans are warming up to diesel and not just because of Audi. The recent development of low-sulfur diesel fuel and exhaust systems has cut nitrous-oxide emissions to levels acceptable even to California, creating a 50-state diesel market for the first time in decades. These diesel engines now emit 30 % less green house gasses and increase milage by 40 %. Diesel also burns more effectively than gasoline and hybrids, therefor diesel generates more power.
However, Diesel does have some disadvantages. Premiums of $2,000 to $4,000 are common for cars with the diesel option. And diesel fuel prices can be unpredictable. Diesel spiked as much as $1 higher than gasoline in the summer of 2008, but the two are close to par now. 
Diesel is still a work in progress but who knows, maybe you're next car will run on diesel.


http://online.wsj.com/article/SB10001424052748703632304575451720343127244.html?mod=WSJ_auto_IndustryCollection