I think Audi and all call manufacturers will start making serious attempts to improve gas mileage. A twin turbo'ed, smaller V8, may improve low/mid/high end torque AND, if designed/driven right, yield better fuel consumption compared to a larger V8. There's no shame in a tt I6 or V6 niether. Look at that 335i, GTR!, and 911Turbo! All three of these cars kick serious ass and have no gas guzler tax.
Joseph
San Diego