I regularly see 30/32 miles in the better weather which feather off slightly to 28 miles when the temperatures drop, in the winter with the heater on 18 miles.
No, I drive normally, but I do keep to the speed limits, if what you are saying is correct, it would appear the XC40 PHEV is not a particularly efficient PHEV.
Unfortunately I have suffered a brain injury and occasionally I get confused and often say the wrong thing.