I have been familiar with MMO for quite some time as i used it a lot in my older muscle cars and what not since they just aren't as happy all the time like fuel injected cars. My dad always told me it was good to help extend engine life since it was upper cylinder lubrication. He is an ASE Master Tech by the ways.

Granted i have never heard anything like there where you would see that much of an increase in gas mileage. One thing that i think should be taken into consideration is all the cars did have higher mileage meaning at this point they were lacking in compression and the MMO helped restore that and make the engine run better.

Id like to see someone try to log the results with a newer low mileage car. Heck i might even give it a try to see how it goes since i just got my xfire and MMO definitely will not hurt anything!