I to use Diesel Place. You may be referring to the 40 to 50 page thread that I was active in a few years ago. I thought I would get a new lubricity study done by organizing and doing a little research. I found that the HFRR test was too expensive and the work was more than I wanted to tackle. I have not looked at the thread in a while, but I am sure it is still going. I think that there are other places on the web where the study done was in question because of the way the sample were sent in from the manufacturers in some cases.
I use the Id draymorris on other sites. My post on my injector saga "with a surprising outcome" gives some of the experiences that I base by opinions on regarding injectors, fuel and fuel additives.
You getting that many miles on injectors is great. I know of many people that can say they too have that longevity in their old Duramaxes. I drive a 04 Chevy 3500 and have no intentions of getting anything different.
Since this site is about equipment, I would like to say that I believe that there are some difference in our views and opinions regarding fuel in equipment and fuel in our pickups:
I think that because most equipment is owned by someone who makes money with the equipment, and many times is not the person running the equipment, and...does not keep documentation keeping up with the costs of operating each machine because they are too busy doing other things --- most would not even consider treating the large amounts of fuel they use.
Also, most don't know that concentrated less costly treatments may be available for large quantities.
Also, many, if not most fuel sales people, play-off treating fuel - " why would you want to treat something that does not need it" is what most salesmen would say. But a large distributor hear in N TX has teamed up Power Services and delivers treated fuel and include a tank maintenance program if you buy that fuel.
If I remember correctly, the concentrated PS Diesel Kleen cost me about .01 cent per gallon. I have to buy it at a fuel distributor.
No one can easily determine efficiency in heavy machinery.
I could go on and on, but I need to go for now.