I’ve had my XC40 B4 for just over a month and been averaging 40 to 42mpg without really trying. I’m pleasantly for such a heavy car was expecting low 30s.
Just checked my log and I can see that for 75,717 miles the average is 41.8mpg. Remembered I was stuck in traffic in Edinburgh last week taking 17 minutes to do 1.3 miles so looked that up. 13.2 mpg for that one but I don’t think it ever got out of 2nd gear !!