Where such method, using gasohol 91 reduced until no incentive, refining oil producing gasohol 91 came out and sold, making gasohol 91 was cancelled by default as a mechanism for such price.
Such an approach, which will make the gas, gasohol 91 is reduced gradually. It is an incentive for refineries to produce oil, gas, gasohol 91 released again. And gas, gasohol 91 was canceled implicitly by the price mechanism.
This approach will make great use of gasohol 91 gradually reduced. The incentives to produce ethanol refinery group 91 out channel and make gasohol 91 canceled implicitly by the price mechanism thereof.