Coopersale said:

My camper, keeping to a max of 60mph on the sat nav 29mpg.
My Iveco 2.3 same engine 34mpg
Both tend to run near max weight all the time.

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Yes always max speed 60 is most eco with full load.
Often see silly twits doing 70-80!! must have deep pockets!

Old 120hp 2.3 57 plate averaged 36mpg (doing same run each day) @ approx 50mph one way and 60mph the other.

3.0 180 Euro 5, (remapped superchips)
50mph @45mpg, 60mph @ 42mpg, 70mph @36mpg


2.3 Euro 6, now with 34,000 miles,
50mph @ 32mpg
60mph @ 29.9mpg (can't get 30)
70mph forget it, sounds like engine will blow up @23-26mpg

Using sat nav speedo,

Massive on/off misfire 60-70mph as well, on the list of many faults for them to look at