You've definitely been pointed in the right direction. The difference between 3.73's and 4.10's when cruising really isn't bad. It's just a couple hundred RPM's so your Gas Mileage won't suffer much! Either way, when you first install gears your first few tanks aren't going to be that great. Because you're definitely going to have a heavy foot and will be burning fuel pretty quickly! I remember when I first installed 3.73's on my Manual 2011 GT, I couldn't stay off of the throttle.
The general idea is if you have an Auto go with 4.10's and if you have a Manual go with 3.73's. I hope this helps! Let me know if you have any questions or need some assistance in the near future.
Dan Bailer | AmericanMuscle.com
Toll Free: 866.727.1266 | M-F 9AM-9PM EST | Sat 9AM-5:30PM EST
Bama Hotline: 888.226.9764 | M-F 9AM-5:30PM EST | Sat 9AM-5:30PM EST
Free Same-Day Shipping!