Last week you claimed I was wrong, when I stated gas engines tend to make more power then diesels (when at similar tech levels). Now it seems since you could not win that argument, you have changed things around and saying the disagreement was about miles per gallon? Who here on this forum said anything about gas engines getting superior MPGs when working hard, then diesels? I know I never said anything close to that, nor did Mr. Buick-Deere. Who are you saying made that claim?
Again, a non-turbo gasoline engine will just about always make more power and torque then a non-turbo diesel, if same bore and stroke. Same with a boosted gas engine versus a boosted diesel. It is silly to compare a naturally aspirated gas engine to a turbocharged/intercooled diesel. I posted a lot of tech specs to back this up. You posted no real facts to the contrary.
That all said, when it comes to actual overall economy? Besides the extra purchase price pf a diesel, and extra cost of maintenance - there is also the issue of cost of fuel.
I have a 1994 Chevy 3/4 ton 4WD with a gas 350 engine. A 1000 mile trip at 65 MPH will get 12.6 MPG. Total fuel cost is $150.79
I also have a 1994 Ford 3/4 ton 4WD with a 445 turbo diesel. A 1000 mile trip at 65 MPH will get 14.2 MPG. Total cost of fuel - $172.50
Are there diesel trucks that do better? Sure. My 1992 Dodge Cummins 4WD will get 18-19 MPG doing the same highway driving. That said, I have a 2008 Ford 1/2 ton 4WD with a 280 cubic inch engine that will get 22 MPG doing the same trip.
I am still trying to figure out exactly what it is that you are really trying to argue? Perhaps diesel are just "better" because that is how you feel?