These guys in your link are comparing a tank of straight gasoline to E85 as run in a flex fuel vehicle. Doesn't really apply to adding "some" alcohol to a tank of gasoline in an old car without special tuning like we are talking about. A better place to find information on what we are discussing would most likely appear in a car enthusisast magazine.
Also, understand that NREL is a biased source in favor of the "government's" bias to put us all on alternative fuels -regardless of whether they are better or not. The original mission of DoE was to get us off of oil - which is a pretty dumb objective since fossil fuel holistically works best. But who would expect brilliance from Jimmy Carter? I worked with NREL/DoE in my last job professionally. I assure you that they aren't going to publish anything that portrays alternative fuels in an inferior light to make the "government approved solution" look bad. They don't get program money for saying that gasoline is fine and works great. There's the bias...
Since our objective here is to "work around" government emission standards to make our cars pass emission tests by adding "some" alcohol, official government sources are probably not going to be very helpful.
