90 mile round trip down the m20. I saw 60mpg at a constant 50mph. Averaged 37mpg on the return leg.

That's what the car says. In reality the true figure is 3 to 4mpg lower. All LR cars from 1984
2021.5 Vogue SE D300 Carpathian Grey
2018 Vogue SE British Racing Green GONE

With a mix of short journeys in the week and longer motorway miles at weekends my average sticks pretty solidly to 32mpg overall.

I did do a ‘steady’ drive to Dundee last year and managed to get a trip average of 43mpg.