I did a bit more research on this stuff & looked up their website where they provide a data sheet, which says:
When ethanol blended gasoline reaches its saturation point because of contamination with H2O, multiple layers are formed. The top layer is gasoline with a lower octane rating, and the bottom is a mixture of water and ethanol that will not ignite during engine combustion. If ethanol blended gasoline reaches this state, a phenomenon known as “Phase Separation”, the engine can be detrimentally affected. This is where Phaser 3000 is necessary because it can actually return these separated layers back to one clear, homogeneous mixture. In this process, Phaser 3000 adheres itself to H2O molecules in the phase separated gasoline by breaking the “H” bond from the H2O molecule and adhering itself to that H2O molecule, thus returning the separated layers back into one mixture. The H2O molecules that are absorbed in Phaser 3000 are then eliminated during the normal combustion process of an engine.
Their recommended usage is also explained, as follows:
Phaser 3000 is recommended to provide sufficient water removal and keep-clean performance at a maintenance treat rate of 1:500 in humid or wet environments. It may also be used at a treat rate up to 1:1000. If phase separation has occurred, one gallon of Phaser 3000 must be used for every 30-100 gallons of gasoline. A 1:30 separation reversal dosage is for 10% ethanol containing gasoline that has been contaminated with 1⁄2% water.
Mike's is selling it for $21 for a 16 oz bottle, which they say will treat 64 gallons of the 10% blend gas, or a cost of about 32 cents per gallon. If it works it's cheaper for me than buying the non-ethanol premium for about 50 cents/gal over the cost of regular.
By the way, I'm curious why someone would rate this thread with one star - what's the problem? This was just a request for information and doesn't deserve the put-down. I see this happening randomly on the forum and it seems kind of petty.