I'm no expert, far from it, but from what I've read (admittedly no real world experience) the 4.0 is a dog. Best avoided. The 4.2 offers similar MPG to the 3.0 and has a big chunk of more power, larger displacement plus an extra turbo. Only thing that put me off was the increased tax. Best part of £500 each year would leave me feeling even more bitter and twisted!
__________________
2010 A8 SE Executive 4.2 FSI D4
2007 Mini Cooper S R56
2008 D3, gone, but not forgotten after 9 years and 90k.
|