These products seem very similar to me. Anyone know a specific difference? I have had good results adding seafoam to the gas/oil mixture in my small 2 cycle engines. MMO works very well added to the gasoline in my older trucks and tractors. I also use 10% ethanol in everything. I recently added 4½ ozs. acetone to the 16 gallon tank of my supercharged 6 cylinder Bonneville. Mileage increased from 22.7 to 25 mpg on that tankful. This was 91 octane 10% ethanol blend. These are just my experiences, and I would like to hear comments from you good people.