SHELBY GT 350 Member
Joined: Oct 2010
Location: Desert Southwest
Seems to me the only ones who should really be that concerned about fuel economy are those running stock gear ratios. Otherwise, the MPG's are probably already breached and it becomes more a concern of straight-light performance.
There are nearly feather-light wheels out there but they cost more than probably most of us are willing to lay down on any setup, and I'm not sure how safe they are for street use.
Shop around and use the old noodle. Be willing to accept some kind of a compromise in any situation.