I purchased my 2021 crew cab LT 3.0 Duramax with the 10 speed. Love it. 12000+ now driven it over half way Cross the ys and back to Eastern NC. Drives great. 22 to 26 in town. 30 to 34 on the road. Drove from one side of nc to the western side. And back 702 miles 32 miles per gallon. Can drive 800 miles on one tank of fuel. It did what the dealers call an over extended start. 4 times in all these miles. So they increased the cranking time a couple extra seconds. Hasn't don't it since. Only used around 7 gallons od DEF in the 12,000 MILES. Sure beats any chevy truck I have owned. And when the E vehicles take over the truckers will still be burning diesel and so will I. E vehicles are a joke. They are not telling people the negatives of E vehicles. How is any one going to drive the ones already built and go on any extended trips. Charging times we kill you. And how are they going to build battery powered semi trucks to pull 80,000 lbs.or more?