You have opened up a Pandora's Box, with that question about diesel. A week ago I spoke to a long term friend that was a supervisor in the Oil Business, and I asked him why diesel was so expensive. I will preface the question with a statement, he is currently attempting to obtain his Commercial Pilot's license.
His answer to me was: "It doesn't make sense at all. Diesel is the first and most plentiful product to come from crude refining. There's no reason it isn't selling for .25 a gallon, except the greed of speculating companies." He further stated to me diesel is not in short supply, that was why diesel was selected at the very beginning for strategic/commercial fuel.
To the topic: If diesel were reasonably priced, and readily available, I would own a diesel automobile. Historically diesel vehicles last longer 300k is not unusual. They offer greater economy, and generate very high torque. These are all win, wins to my thinking.
What do you think?