I totally agree with Dapope...snake oil. Cummins did a dyno test with several brands of these additives that state they can make more power and get better MPG and the report said done of them worked. Cummins highly recommends that no additives be added to the fuel unless it is for a one time use specific purpose like getting rid of diesel algae.
I wish the Federal Govt would make these companies that sell this snake oil have to prove their claims or get it off the market. Kind of like these weight reduction pills or the magnet you clamp around the fuel line to get better gas milage.
"Gunner" USN Retired, Airdale
2004 Monaco Signature 44' Conquest. Detroit 60