Originally Posted by sumfoo1
e85 helps because the extra fluid obsorbs more combustion energy.
E85 works because it has a higher octane rating then regular 91 or 93 unleaded gas. Meaning that it resists pre-detonation (knock) better then pump gas. The need for more E85 then gas is only because E85 has a different Stoich then gasoline. Gas being 14.7 parts air to 1 part fuel, and E85 being 9.7 to 1.