Why is ethanol a better fuel? in General E85 Discussions Posted February 9, 2016 · Report reply R-factor = advantage ethanol How many aware of this EPA factor to award CAFE credits to automotive? This formulation a inheritance of the 80's. It's a complicated formula, but as I understand it's a volume metric benchmark per fuel Btu content and offset of petrol aromatics within the fuel. It's hasn't been updated per the ethanol's ability to increase engine efficiency. Most within automotive industry claim the accurate factor should be close to one and if updated this would provide a big incentive for manufacturers to build mild level ethanol optimized vehicles. It's hard to get good inside info from this industry. Keep in mind the risks and rewards are great and they participants don't like change. They like a subtle collusion to stick up for each other's wealth and control ability for it. Government agency in the mix, as well. They have experts on each side that could embarrass each other or earn a lawsuit. So, this stuff is closed door, stiff lip service to keep average consumer scratching heads as why so much nonsense within the big players. They don't appreciate competition, especially if it makes them look less capable, less efficient, or they lose income stream. You notice the convenient fog of complexity works best for the big players. This just the juice to keep competition away. If ever the voting public wanted to understand the truth and invigorate the best of our economy, we would demand that regulations be simplified and understandable per 8th grade skill set. Just the exercise in doing so will foment better understanding of the law's intent and keep the public informed of the big picture and most important elements. Were spending way to much of our time and GNP on regulation compliance. Complicated does not equate to better or more accurate. Pareto analysis. If all this complication is deemed required per our litigious modern society. Start their to end the nonsense.