I have never used it before. But I just bought a 5 gallon pail of it! I have 1 more litre of howes meaner cleaner to use up before I try the amsoil. I bought the 5 gallon pail for 170 loonies up here, and they claim a mpg increase just like the meaner cleaner and that it should "pay" for itself. Guess we will see! The savings over just buying 1 litre bottles of meaner cleaner to treat the same amount of diesel is around $70 loonies. It is all starting to make sense to me now!