I don't see the point of giving your MPG figure from the "from Start" part of the trip computer, surely the overall since reset gives you a better idea?
Anyway, over 4000 miles the average on the trip says 33mpg, do a tank to tank calculation shows 37mpg average, all types of driving, mixed dual and A roads town and lanes. not too bad, but i still think it could be better.
Just nipped down to Bournemouth to check the beach hut, 51mpg on the round trip.