And there's also the added cost at time of purchase. When you add from 5 to 10k more to the sticker price for a diesel. You have to keep a vehicle for quite a while to offset any advantage. And while a well made diesel engine will last a very long time, I don't know about the cars and trucks they put them in. Not a wise buy for most ordinary folks and their transportation needs. I by the way have been a diesel mechanic for the last 30 some odd years in the trucking industry. I don't want one in my personal truck. Could be im just tired of smelling diesel fuel.