I have a 2019 Colorado Z71 V6 4x4 with about 18,500 miles now and the purge valve failed at about 12,000 and was replaced under warranty. No other issues.
I've got the GM performance cold air intake and a Corsa exhaust on it and I'm currently getting 17.5 - 18 mpg on winter blend fuel. With summer blend I get 19 - 19.5 in 70% city/30% highway driving when I drive sanely.
This is my second second-gen truck and I'm really pleased with it. I've owned a 2005, 2006, 2007 and 2017, also and this one is a crew cab and the best one yet.