When we were visiting our youngest son in Chilliwack BC he showed me some stuff he was using in his two vehicles, so I threw an ounce in my tank, and then filled up next day and drove home. After about 350 km later, I filled up again, and checked my gas mileage. I was amazed to find that I had over 27 mpg city and highway(imperial gallon)and I do not spare the horses. We are on our second tank now, just put another over 300 km and I will check mileage again, but this time will do it in metric. Another benefit seems to be that the engine is running a lot smoother than it was prior to the Lucas treatment. I have 65000 km on this car, hardly broken in V6 and it was not behaving as I thought it should, even though I have religiously used other types of injection cleaner every other tank full. I have had a car since 1941 when I got my first Model A at age 16, 65 years ago, I have used all sorts of additives, different oils, covered over 2 million miles and can honestly say, that I have never had a product which produced this kind of result. Thank you for a great product and I only wish I had another 20 or so years to use it! Oh well, it will be in my car's engine from now on! old Doug in BC