After seeing your impressive demonstration of your Prolong products, we made the decision to test it in our truck #53, which is a Cummins with 552,433 miles and a 12315 transmission.  (We used AFMT in the crankcase, transmission, front differential, rear differential, and to each of the front wheel hubs.  We then applied Diesel Conditioner to 200 gallons of diesel fuel).  After the first week of travel, which was about 7,000 miles, the test results showed that the mpg went from 4mpg to 5mpg, an increase of 25% in mileage, or an additional 200 miles per fill-up.  The driver of the truck (who was never told of the Prolong addition), noticed that the shifting of the gears was so much smoother and easier.  He also noticed a substantial increase in horsepower.  In general, the whole truck runs better and smoother.  We hope to be able to add it to the rest of our tanker fleet soon.
M. Autrey, Chief Mechanic, Cantley Transportation, Inc.