I’m with Texases on this subject. And that brings up another point: 15% has been approved by the EPA a fuel for over-the-road vehicles, but not mandated. If it’s not well accepted by the public it may not become commonplace.
It costs a lot of money to set up an additional system. In fact, your station current has two tanks, 87 and 91, and mixes them in the pump to get 89. It won;t be able to simply mix 15% with the 10% to get its mid-grade, it’ll have to be a whole seperate system. I don;t see stations making that investment unless 15% is made mandatory, and I don;t see that happening because of the “2001 or newer” constraint.