Not to interrupt the sales debate, but a real owner of a 15 weighed his stock GT (fully optioned) recently and it weighed out to be 3,780lb WITH 3/4 tank of gas. This lines up pretty well with Ford's claims of 3,705lb curb weight....which also means it is only a 80-90lb increase over the previous model...not 200 and other ridiculous numbers people have been throwing around.
Heres the link so you can check out the proof yourself. First 2015 Mustang GT (Fully Optioned) Weighed by Owner | 2015+ Mustang (s550) Forum News Blog – Mustang6G | The Ultimate 6th Generation Mustang (S550) Enthusiast Site I really don't thing an 80-90lb increase (given the changes) is anything to complain about.
But thats my opinion