Before a trip to AL for a NASCAR race, I added a bottle of fuel treatment like I do before any long trip. This time, the auto part store suggested Lucas Fuel treatment so I added one bottle before we left. WOW, after a day of driving I noticed that the car was running a LOT smoother and had the power it had when it was new. After returning, I reviewed my gas economy from the trip and I found that even using the AC and spending a lot of time idling in the NASCAR traffic, I was getting the MPG that I got when the car was new. I then compared it with the economy from our trip to DC in February when I was not using the AC or stuck for hours in traffic and I found that the product I used back then did very little for my fuel economy. I actually got about 3 MPG more form your product with the AC on and stuck in traffic! I am going to add your product to my service schedule so that I remember to add a bottle every month to keep up the fuel economy as fuel prices continue to shoot up.