I think I have seen 40 mpg once and that was with a virtually empty tank on a 40 minute journey but I don't have cruise.
I averaged 34 (Computer) on a 112 mile journey yesterday which I'm content with.
When I first bought the car I was bothered but not now. I typically sit around 28-32 mpg and its rarely below 25 mpg.
Just enjoy the car and been glad you went for the GTI and not the TDI
![Tongue :P](https://www.mk5golfgti.co.uk/forum/Smileys/newsmileys/tongue.gif)
Its already been said its very dependent on your mileage and type of roads you drive on, if your motorway crunching then you wont see the best of the GTI.
I don't think I could stick to 60 on a motorway, I just get bored.