It's all to do with how you drive it, some have had 20 something to the gallon, others may see 30 something to the gallon.
Example, I can get 40 something to the gallon out of my mapped 1.8T where as others can't.
If you don't understand what it is exactly you're doing and what is happening with your throttle responce, revs and gear selection, then you'll never see the best MPGs.