If money was no object why would you care about fuel consuption
Also audi 3.0 v6 mapped to 300bhp as fast as it is, souless engine.
the question never mentioned cost; and the audi engine is actually quicker than the zed; then engine may be souless but in a zed body it should make the combination alot better.
it also means i wouldnt need to drive like a grandad to eek out mpg; could still drive hard and easily get 30 mpg, or take it easy and get 50 mpg.
...
as for driving style the brake pedal is the hugest issue with fuel consumption, everytime you brake you have to use more fuel to get back up to speed. controlling the speed by just lifting off and reapplying the gas to maintain a speed is far more economical.
leaving decent braking distances etc weight reduction etc all helps