as above really, town crawls will see between 24-26mpg. 70 cruise will see 33-35mpg. Considering its a high performance motor, it puts other cars like the ST to shame in all departments.
My advice is for gods sake man!! Buy it. Tis a cracking car and quite sort after.
Make sure it comes with plenty of history, or take a look at VW dealerships Computer to see its history.
Whats the spec/colour?