There are two things about that article I disagree with. Other than that it is good.
1. The use of E85 only requires a max of 30% increase in fuel over gasoline and less if the ethanol content is less.
2. In the United States the ethanol content of e85 can be anything from 70% to 85%. I really don't know where they are getting 50% but that may be because other countries have different regulations. In the US it is illegal to sell e85 with less than 70% ethanol content.
We have a thread on e85 and it pretty much highlights and agrees with the article but it goes into greater detail about how the power is actually made.