Why would anybody need a 1200Bhp Quad Turbo W16 for everyday driving that gets 8Mpg? Why would they need the latter? At this level, Its more about wants and desires more then need or eficiency, 150k-8million whatever. If you can afford cars in This price range, MPG is the least of anyones concerns, Who buys these and says, Hey, My 6.3L+ N/a V8 isnt getting 45mpg what the hell?...Im in charge of a major multi million pound company, I should disguise myself and my Aston DB9 because its not T-t-t-t-bocharged!!!-_- lol
And im pretty sure there are plenty of CEOs here driving 6.0L Aston V12s and E60 M5s and C63s etc
Given the average consumer of these types of cars, I dont think they could tell the advantages and disadvantages of the aspiration and/or liters, Nor would most car even if they new, Maybe a real car nut, But other then that its unlikely.