Is that important? That's
Is that important? That's like saying I have no place talking about foreign policy because I've never "been there" or asking why cops act like they do because I've "never been a cop." It's a lame argument that means nothing. I could ask you: How often do you go to the race track with your rear-drive performance car, Patrick? If you say anything less than "every weekend," you're wasting money on a car you only pretend is a performance machine because you don't actually USE that performance for anything. Right? Same logic.
I haven't owned any because I don't buy them. I drive them and get other people to give them to me for that. Why would I buy a car I don't have to buy? For the same reason I don't own a semi-truck. I drive them all the time, but don't own one. Why would I? Other people will let me drive theirs.
Besides, you're missing about 90% of the Mustang's actual market: people who drive them daily. They might "feel" like they're in Fast and Furious because they have one, but they don't actually DO anything with the car. For them, maybe having some fuel efficiency is a good thing. Maybe that's what they want, but they also want that feeling that they have a sports car. Given the low-end torque inherent in diesel, this would give that 90% the FEEL of a sports car at the light and stop sign - the places most of you wannabe racers get your jollies most of the time anyway.