The strangest thing is, My vr6 gives me an honest 30/31 mpg. Don't get me wrong, i use it as a toy and tend to drive it when roads are quiet but on a sunday run I can get the trip up to 36mpg. I'm well aware that these units can overread, however, if i actually calculate the amount of fuel i've put in against the miles i've covered if anything you'd swear the computer does the opposite.
Seriously, i wouldn't dream of putting a ten spot into even my 2.0tdi caddy but with the vr6 it seems to last for ages. certainly lasts longer than even my interestingly economical 350z. she does around 27/28.