I own a 2021 Grand Cherokee L Limited. I am getting 16.9 mpg combined about 5000 miles. Mostly city driving with some hwy. It’s seemed to have gone up from 13 mpg. At first I thought the cars computer might be tracking the miles wrong. So I filled the tank drove 20 miles and filled the tank again and did the math and it was right 16.9 same as the car was marking. My wife drives it. She keeps it in auto and she doesn’t have a heavy foot.