Kind of funny how the numbers worked out, E85 up to almost 10% more efficient combustion energy transfer than E0, my suburban lost 18% mpg using E85, from the research I did a few years ago, I found E85 has 28% less energy per volume E0. Pretty sure my fuel source was the N/S Dakota study on mid ethanol blend on MPG. Can't find that one again.
But here's another one that's even better since I used E10 not E0.
http://www.ascension-publishing.com/BIZ/HD2-Neb.pdf
"When compared to the E10 ethanol blend, E20, E30 and E85 fuel blends have 3.5%, 7.1% and 26.5% less BTU’s per
gallon."
Don't have time to read it now and too many pages to print. I'll have to tonight at home.
26.5% less energy - 18% less mpg = 8.5% more efficient and in the range from the graph above.