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I just did almost exaxtly the same trip a few weeks ago 4 up and fully loaded and averaged 40mpg. That was at 72mph on the motorway with my son following in a mini with a black box fitted - hence the low speed.
Life time mpg over 51k is 43.3mpg.
If you were doing 75+ on thr motorway i would say its about bang on right.
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