I did 175 miles on 2 trips last week, majority is at 75mph on the motorway. 1st trip, more motoryway I got 38mpg, return trip, with several detours on A roads I got 40mpg.
For a 2 ton, 2 litre petrol 4 wheel drive vehicle not bad. Same trip using my wife's Prius and it got 55mpg.
Still...