There is a detailed report on it at the website in pdf form I believe. It actually cooled combustion temps of ethanol treated gasoline due to ethanol’s higher burn temps.
Mileage and efficiency I’m not up on. Though I have noticed longer run times by a small margin. I’ve used it for 3 years now in my JD lawn tractor and in every other small engine of I have and problems have been nil for years.
Their Mechanic in a Bottle product allowed me to save a new generator that I had stored for 10 months with Sta-Bil that had failed to preserve the gas.
I drained the gas and added new with MIB. 5 pulls with ignition off and let set overnight. Unit ran perfectly in the morning. Those EPA carbs are throwaways so it saved me some money. I figured it had a partially blocked jet that Sea Foam and Chemtool wouldn’t touch after many tries.
Also try the MIB in a lousy running chainsaw or other two cycle. More often than not it will run a hell of a lot better after treatment. Home Defect has them all.
Running unleaded in those old engines can also crater the valve seats and guides.
Also had a friend’s outboard that routinely ran lousy and the MIB cleared it up immensely. It actually idles now where it would stall regularly.
Its all worth a try and give it an honest chance.
I think I’d try it on a small engine. Not sure about a car/truck with a big gas tank. Thank you for the link, however.