As I've said in two other threads, the 1LE is a great car. In other comparisons the 1LE was significantly faster than even the Boss 302. No surprise that it still bested the 2015 Mustang.
Your historic comparison data is useful. Randy Pobst really knows how to get the most out of a car on the track.
2013 Camaro 1LE 1:22.70
2014 Camaro 1LE 1:22.81
2015 Mustang GT Perf Pack 1:24.32
2013 Mustang GT Track Pack 1:25.77
2015 Mustang Ecoboost PP 1:27.65
2011 BMW M3 1:27.67
2011 Mustang GT Brembo 1:27.76
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