Good points dan - read first post on fuel consumption
350Z is this a 2 seater only?
I took the RX8 for a spin last night. . . . . . Its really a tuff call bud. That car is sooo much fun once you get in the higher RPM... Unlike the 3 which is fun until you get to the higer RPM. Its like completely opposite driving. The 350z is far UGLIER and is only very marginally faster.
I would still have my 6mps ova the 8 as i do alot of city style driving and would not use alot of the high rpm the rx8 has to offer. But get the rx8 down 1 gear from the ideal cruising gear and there is 0 Turbo lag. One little tap and you feel it jump!
Are you brissy based? I could take you for a spin?