Those were the 4.56s. I haven't calculated with the 5.13s yet since my speedo isn't calibrated yet and I'm still breaking them in. The new gears are fun. I notice the difference at hwy speeds, a lot more power. 75mph is 3k rpm. 65mph is about 2.6k rpm (with the gps speed).Was your MPG post with the new gears? How do they feel vs the old?