Those studies include Michael Wang's formulas that are also under contention from the academic community.
Also, the study was updated last year and still had the same results. Read the new study that was accepted into the National Resources Research Volume 14 if you want the facts.
http://petroleum.berkeley.edu/papers/Biofuels/NRRethanol.2005.pdf
They're still wrong.
Read any one of the links I provided above to see why.