Over 38,000 + something Miles I have done an average of 62.5 mpg which I think is excellent . That’s all types of driving town city country lanes motorways mountain passes - and virtually all in D eco mode . My driving is a mix of going out to enjoy the journey and not rushing about to the opposite end of scale taking full advantage of the quick electric motor to deliver some speeding ticket times ….!! My two extreme mpgs have gone from 43 on motorway to 130 mpg driving across Birmingham in rush hour !
I guess your style of motoring is similar to my own, except I don't do mountain passes.
I generally stick to the speed limits, but tend to put my foot down on occasion, but I don't use Eco mode at all, as I find it takes the edge off performance. My two extremes are also similar to yours.
It looks like 38k+ miles in a Mk4 represents a fair annual mileage, well done.