This is one of those regulations where the view has long been proven not to be worth the clime. The reality of this law is that if provides mostly corn states , with a easy market. The fact the the public ends up paying fuel cost that are higher then need be for a product whose value in use is questionable at best. The drivers are politically construed and the results in terms of reduced emissions and increased service cost over decreased engine life and increased manufacturing and distribution cost make repealing this well intended but grossly failed regulation a no brainer. .