Andy
I think that curb weight can be useful only in that it might shed light into how much stuff you can ditch... If we established spec line weight based only on curb weight minus xxx lbs and used the same amount for all cars ( say 150 lbs ) then that would be a very uniform approach. Who cares if I can only pull out 200 lbs out of my car and I weight 260lbs. Some cars can loose more but if we use the same loss it seems less arbitrary. I think I can get a e36 down to 2500 but it will not do me any good ( legally), and I think the RX7 should be less based on it's curb weight..