my dealer doesn't even sell the stuff. relax, i am not talking about gumout, it is an additive that lucas oil sells, too.
Ethanol / E10 fuels increase the amounts of water and sludge in your fuel tank.
Star Tron breaks down this excess water and sludge to sub-micron size allowing it to be safely burned away during normal engine operation.
Therefore Star Tron prevents phase separation and fuel gelling, eliminating ethanol fuel problems.