“Let me put it this way, there are pluses and minuses in using ethanol and we just want to make sure that both sides are studied and heard first,” Recto said.
What pluses? All I see would be minuses:

-E10 gasoline gives less fuel mileage than regular unleaded gasoline. This is true even if your car is "Ethanol" compatible.
-E10 costs more. It is only "cheaper" because of government price subsidy
-E10 can damage engines, especially older EFI and carburetor engines
-E10 can rust gasoline tanks because of possible water content
-E10 gasoline "expires" when left un-used for two or three months in a car's fuel tank.
-Ethanol used to make E10 is still mostly imported. It was supposed to be a way to offset the volume of oil we buy from abroad. Yet we end up buying ethanol from abroad as well.
-Land used for the crops for ethanol production used land that can be used to grow human food.
-Based on studies, ethanol production takes more fuel than what it is produced. This is especially true if we are importing it from across the ocean.