I was having problems which I believed were related to gasoline quality.....my Volvo(95K miles) just didn't seem to run like it should. Bought a gallon of Lucas Fuel Additive and put 5 ounces in each tankful. Two months later, my car is running PERFECTLY......smooth with no hesitation at all. Volvo says my car is rated for 29 highway......Last week, I logged 35.1 MPG!!! It goes in all our cars, and the boat as well. Thanks!