It is interesting 10% ethanol is the maximum allowed in the Prius. One wonders where that value came from.

Anyway, your research is interesting.[/quote]

According to an online article from Morningstar, a financial research company, "Ethanol is notoriously difficult to transport via pipelines because of its corrosive properties,"

So, let me ask: Is this also a problem for using the higher percentage ethanol in a fuel system which is designed and constructed for an E10? In other words, are there more than just injectors involved? What about that bladder in the gas tank? What about the fuel lines? The pump? And what else is involved?

Could that be the reason why Toyota draws the line at E10?