I have a 2021 with about 15,000 miles. The diesel engine and the 8 speed transmission have been the high points of my jeep. I get 32 mpg on the hwy but I drive at around 68 mph. Very nice acceleration especially at the lower end. Just as others have said, uconnect, steering and wiring...
I am loving the diesel 3.0 as well. Feels great at the low rpm's but it response when you step on the throttle. I have driven diesels for years so I understand you have wait for them to warm up but the 3.0 warms up quickly and its ready to go.