OK so I'm really lovin' the MMO. I was using the 4oz per 10 US Gallons of Gasoline as prescribed on the bottle but I seem to have found the sweet spot for my vehicle by adding 2oz per 10 US gallons. The engine in my Santa Fe is super quiet, it seems to be peppier on the take off, and I have had a very noticeable increase in fuel economy which I have verified by running two full tanks with out the additive and with it. According to my Scan Gauge I have reduced my fuel consumption from 11L/100KM to 10L/100KM (21.4 MPG versus 23.5 MPG) I can duplicate this by stopping the additive for two tanks and then resuming it as my driving is pretty much predictable. I'm scratching my head, out of all the additives I have tried I have to say this one is the absolute best for the fuel system and my engine seems to sing when running on it. So I think I'm going to run this regularly with every fill up and just run a fuel system cleaner with PEA like Amsoil PI every year just to make sure the fuel system is clean. I'm using this with Shell's Nitrogen Enriched Fuel in case anyone wants to know.