Ethanol Gasoline Emissions Study I SMELL A RAT

I'd guess that Matt's posting is about work done quite a while ago (he mentions catalytic converters not being required at the time), and the manufacturers' tuning specification for the engines was based on the assumption that one was burning unblended fuel - thus not likely to produce the best emissions profile when burning blended fuel. Nowadays manufacturers assume blended fuel and build and tune the engines appropriately.