I have a 2021 GMC and I absolutely love it. Love everything about it, however I have had some faulty knock engine sensor issues that the dealer is still trying to figure out.
Around town 23 mpg, best is 32.5 mpg, and towing between 17-18 MPG depending on terrain.
Just over 30K on my 2021. So far so good. Average about 21
Bought 2023 chevy RST package yesterday (sorry didn't pay all cash). May have it end of week or next week, left it there while waiting for them to install the leather seats.