It’s a 2011 facelift XF 3.0. V6 diesel portfolio beautiful car.
Methinks his fuel computer is telling porkies, as no way will he get that sort of MPG unless driving everywhere at 50mpg.
My XJ - same engine, same weight - averages 32.5mpg over several tankfuls. Manually calculated, as the fuel computer is worse than a cheap watch.
Rarely agree with you, but on this occasion we are aligned.
I would be expecting low to mid 30’s at best from V6 diesel, mid 40’s with 2.0 latest XF.
I suspect you will achieve better than me, given your style and your commute. If I keep mine on the motorway and at 70mph, I reckon I'm in the genuine mid/high 30s. Cant prove it, as life is too short to do that over a whole tank. I was doing well on this tank, but all ruined on my dash of mercy to get Mrs TB off the hard shoulder, and middle lane hoggers getting in my way, causing heavy braking and hard acceleration.
General consensus from those that have bothered checking (most owners don't, as Jaguar would never tell porkies, and the dealers are the best people to service/fix the car, because they make nice coffee) is Jags from that era over read by 10-15% at least