Ahhh just throw a good ethanol treatment/additive in your tank once and a while and you'll be right as rain. And, ethanol or E10, has been used since the Energy Policy Act of 2005, which is written by the EPA to ensure that gas sold in the U.S. contained the minimum amount of renewable fuel(10% Ethanol). But what's really going to boggle your mind is that Ethanol has been used in engines since 1826!
Many 3rd Gen Hemi's are still running strong even with that corn crap in the fuel.
That warning is in every manufacturers owners manual to cover their butts.