2015 Mustang was rumored to be 200-punds lighter but, to tell the truth, it gained some weight.
Base curb weigt for the Mustang V6:
3526 pounds manaul transmission (30 pounds more than the current model)
3530 pounds automatic transmission (12 pounds more)
Base curb weigt for the Mustang 4-cyl EcoBoost:
3532 pounds manaul transmission (36 pounds more than the current V6 model)
3524 pounds automatic transmission (6 pounds more than the current V6 model)
Base curb weigt for the Mustang V8:
3705 pounds manaul transmission (87 pounds more)
3729 pounds automatic transmission (54 pounds more)
Official: 2015 Mustang horsepower ratings.
Official: 2015 Mustang full price list.