update
As an update to this thread I've just returned from a long trip up to Newcastle, Edinburgh and Glasgow. A total of 653 miles brim to brim fill up with the car fully loaded, cold weather and the tyres at 36psi returned an actual figure of 42.4mpg, the onboard computer stated an average figure of 43.2mpg.
The fuel computer was showing 50 miles to empty when I refilled it.
The car has now done 20,000 miles.
Not bad for a powerful full time awd estate car.
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