I just analysed a recent journey from Bournemouth to Byfleet and back which is 180 miles of mostly motorway or dual carriageway.
Once out of the urban, about 5 miles, I told the car to save the battery, put the battery back in play as I headed into Byfleet and saved again on the return until I got near home.
I tried to get back with zero battery range but in fact it showed 3 miles left. It’s hard to estimate because of gaining charge through regeneration.
So, 181 miles, cruise control on 65 on the motorway and 59.1 mpg (plus the battery charge of course)
There was a lot of traffic at the Surrey end which I will try to avoid next time and see if I can hit 60mpg!
Not that I’m concerned too much about fuel consumption but it’s interesting to see what the XC40 PHEV will do.