I have a little over 4K miles on the new (sorts) Colorado I-5. Seems to have plenty of punch. I haven't noticed any increase in performance as the motor breaks in like I did with the 4.3 or the 2.2 in my last couple of new small trucks.
Bebopping around town in stop and go traffic I'm getting a little over
17MPG. I think that figure is low because, I use it to pull my smaller boat up to the river all the time, and I am sure that has an affect on mileage.In the last 300 miles I probably pulled the boat 90 or 100.