According to the DodgeGarage website the carbon fiber wheel setup saves approximately 32 lbs over the standard Redeye Widebody wheels, interestingly, they don't mention the weight savings of the standard Demon 170 wheel setup over the standard Redeye Widebody wheels, probably because there isn't close to $12,000 worth of weight savings there. I know I would stick with standard Demon wheels and buy aftermarket forged drag wheels, they would look better and probably be comparable in weight to the carbon fiber wheels, or possibly lighter if going with a 18x5 front setup.
The optional Lacks Enterprises carbon fiber wheels shed weight from the Demon, with the lightweight 17-inch by 11-inch rear wheels shaving a total of 11.98 pounds off the rear compared to the standard Redye Widebody configuration. Front 18-inch by 8-inch wheels save a total of 20.12 pounds off the front.