The GELL POINT of 100% biofuel is about 37 degrees (F). Ahould be interesting at 50,000 feet!
The only fuel that could potentially work and that is being developed by Bell Bio-Energy! This is REAL oil, not subject to GELL at temps above 0 degrees(F).
http://www.bellplantation.com/images/BPH_Newsletter/April_09/Fort_Stewart_Press_Release_No-2.pdf
Your info is way out of date. They solved the gell problem months ago, proly the military solved it years ago.
Trust the military on this one, they do not want expensive bombers and fighters falling out of the sky. They did not buy 600,000 gallons of jet fuel that gells up in use.