Nope, had a couple diesels and don't miss them at all.

I have built magnum motors, a lot of them, and I can assure you from personal expience they respond VERY favorably to a few minor changes both with more power and more MPG. One time I took a 318 magnum, ran real tight quench and picked up 3+ mpg and had less pinging with no other changes at all. I have also seen substancial improvement in MPG and TQ with regrinding the cam to reduce overlap and increase lift a little. Injector swaps help a lot also. Again this is my personal experience with my money no one is paying my to sell a V10.

The reason no one bought the V10 is they failed to do the math when the times changed and diesel went way higher than gas. Even a stock V10 pulls better than a stock 12V hands down.