Drove a Jaguar XF Diesel S and got 13mpg ???

[culpano]

Drove it on a 20 mins run, mixed twisty road, motorway and town driving.
Ok I did floor it a couple of times but 13mpg ????

[culpano]

Nah I absolutely thrashed it. I did reset it and drive it sensibly and at one point it got to over 42mpg.
Its a great motor.