My little 4 cylinder already had good fule milage, so when I decided to put Lucas Fule Treatment in my tank, I thought I was just "keeping" injectors clean and carbon away. I was in for a surprise when I found that my mpg skyrocketed and a gain in hore power was obvious. Since I have regularly used other fuel treatments in the past, I didnt expect Lucas to be much diffrent. Man was wrong, this stuff is way better.