Reason people dont get diesel prices. That is price of a diesel vehicle is more expensive as well as gas prices. Diesel used to just be the bi product after making gas. It used to be cheap. Now with all the regulations diesel has to go through a lot more steps before it can go out on market causing it to be more expensive. Yes its alot cleaner than it used to be and they have have improved diesel engines to have emissions even cleaner. A diesel motor will last you a good 500000 miles compared to 300000 gasoline car. Yet again that all depends on car and driver but those are close estimates. Problem is who wants to buy a car and keep it for that long. Some yes not everyone though.