To the OP - if you are asking about the mpg and running costs, dont get a GTI. You will always be looking at how much its costing - how much the fuel is costing per week, and so on.
I asked about mpg etc before I bought my GTI, and I always look at costs now - trying to save where I can.
Its an expensive car to run, and, as much as I love her, Im now questioning whether I should keep or sell mine.