Just did a fill up with Shell, Diesel V-Power, only put less than 200 km in the city, so too early to say, but initially it does seem to give a little better fuel mileage and pick up. I post once I figure the gains if any. It seems to give an extra 1 km per litre or better.
When the truck is running under normal temperatures, it seems the REGEN distance is greater. When cold, I haven't notice a difference in that area, if there, it is probably too small of a difference.
Whether paying an extra 8 cents per litre is worth it, probably not on the bases of fuel gains, but, the other additives that some are putting into each tank fill up would be break even scenario. I may gain, the claim benefits, anti-gel, water dispersion, anti-rust and clean fuel jets, etc. I keep posting once a conclusion is possible.
This is the first time, using it, I expect, it may take a few fill up, to clean out any build up, gunk, etc. after driving over 17,000 km using the cheapest of diesel.