With higher mileage requirements "at gunpoint" less oil is needed.
You got something against mileage requirements? Mandatory, Federally mandated, mileage requirements?
No need to foul the waters.
Ever lounged around a California beach near where oil is drilled off-shore? It's a half-gallon process. It takes half a gallon of gas to get the tar off yourself afterward, and you still have a brown tinge to your skin.
Arf