The only way for me to have a "scientific" study would be to get 5 tractors all the same, run the same amount of fuel from the same supplier for the same amount of hours using 4 different diesel treatments and one without for a control. Then pull the injector pumps and compare them to determine which one had the least amount of wear.Unscientific studies are better than scientific ones.
Hearsay evidence is better than actual evidence.
It is a new age.
Seems like a lot of time, work and expense so I'll just have to take this study at face value and try to put the best option I can for my needs in my machine.