Don't be a dick.
Yes it's a thirsty sports car. But 99% of people that own 350z aren't billionaires, and some 350's don't exactly go for premium money anymore. So while it's not, and obviously shouldn't be a major priority, it's a perfectly valid concern.
sorry but if anybody thinks 1 or 2 mpg between a jdm and uk version is going to make any difference to their pocket then then they are the dick, the difference in insurance is probably much more of a consideration surely?
When I fill up the dte says 400 miles I thinks that's rougly 25mpg but it's all down to driving style, type of fuel, servicing, tyres etc etc