In particular, their Diesel Power Ecomax.
My limited experience with it seems to indicate that while it may look just like all the other "snake oil" injector cleaner/performance boosters, it ain't snake oil. It actually seems to do what it says on the tin.
My Kia's consumption has been slowly deteriorating since purchase (from new) rather than improving as I'd anticipated. I thought I'd give the Miller product a whirl as it's well reviewed and whilst I can't claim to have performed any strict consumption tests, my range per tankful on supermarket fuel has been improving and it seems to be paying for itself and then some.
Any regular users here? What are your experiences? I've got no ties to the company, just a user.
Tim