the all controversial MPG arguement

All depends on the car and tuning. I have a customer with a 422" small block, in a heavy E body, that gets that mileage and it's 480hp by the mph and weight. Another with a B wedge stroker 496", dyno'd 480 to the tires, that gets 15 in a heavier E body with a 727 behind it. Some guys can't get mileage to save their lives. Some can.