The Renewable Fuels Association (RFA) has partnered with off-road Jeep designer Kenny Hauk of Hauk Designs to build a flex-fuel E85 Jeep Wrangler JL that will highlight the benefits of ethanol blends in high-performance vehicles. The special “Hauk Machines” Amazon Prime video series kicked off August 12 exclusively on RFA’s Facebook page with the first “mini-episode.” RFA Vice President of …