With traffic theses days Jim.... we all do
I will report back on this later....I have done neither the mileage or the type of driving that would give any reliable result, the only really long runs have been to the CC national show and Hastings, both trips were massively stuffed with bad traffic and high temps, only on the way back from the CCC event (late night) were the roads clear and I took a very long way back across country to "test" the car (hampered by SH17 lights !....must sort them...must sort th..)
I would think with, as in your style, a greater concentration on cruse/smoothness then it could happily climb into the 30+ mark without to many problems on A's, M roads with tick-over revs/cruse control, I can see 35Mpg is obtainable..