Semantics? I mean you are right about the turbo but as you say diesel lends itself to turbos or boost compression more so than gasoline. DI isn't going to go very far to bridge that gap. My 1987 computer controlled sequential port fuel injected and intercooled Buick grand national can normally (atmospherically)only take 17 to 18 psi of boost before risk of detonation or pre-ignition. And that is at 94 octane. When I did a Xylene mix which brought it up to 100 octane it was safe to 22psi. With race gas 24 to 26psi and the turbo itself became the limiting factor. Diesel does not have that problem.
Look I've raced and built a few engines but am no guru of fuel types or engine building. Anyway I don't see a turbo gas producing more than a turbo diesel at least not on pump gas. And assuming you make enough power then it becomes more about fuel consumption and possibly longevity Naturally I have been wrong before and I am always open to learn but I really think we are hi jacking the OP's thread. He wanted to know about the EcoDiesel as a potential TV for him.
Oh and the ED driver who flew up the grade dragging a trailer then slowed at the top probably overtaxed his cooling system and the computer pulled his fuel to protect the engine from an overheat situation. So it probably wasn't a power situation that you were seeing so much as a driver overloading his trucks cooling abilities. Great truck inside its reasonable for a half ton capabilities.