Nice comparison. I am sure the performance of the Hellcat is because of the "expert" driver. I don't think it would be nearly as good with a "non-race car driver." I doubt the Z28 number would change that dramatically with a "non-race car driver'(But it would change). The good news about the Hellcat is that the shocks are fully adjustable, from the dashboard, and the "street ride" is really nice.
2013 Mustang GT Premium Convertible
Candy Apple Red, Auto, FRPP Tune, GT500 Axlebacks, KONI Yellow Sport (adjustable dampers), FRPP Front and Rear swaybars, Custom Removable 4 Point Roll-Bar, BOSS 302 Low Expansion Brake Lines, Roush side splitters, GT500 spoiler, Redline Tuning hood struts,18" Ford Chromed Aluminum Wheels (9R3Z-1K007-A), Michelin Pilot Super Sports - 235X50X18
2011 Mustang V6 Premium Convertible - Gone