Hi man,
I've just recently come into GTi ownership in the form of a mk3. It drives amazingly, like new (it has 103,000 miles on the clock.)
I've been warned that a common problem can be changing into second gear when cold, this was by a mechanic friend and I have no experience of this.
Are you looking at an 8v or 16v? According to the trip computer I'm getting 40mpg on my average journeys, although this drops if I'm heavy footed (like i say, this is according to the trip, I haven't worked it out properly). I get about 330 miles to a tank and it costs £50 to fill up from empty.
I love my mk3, I would hold my hand to my heart and say it's the best car I've owned. I've had 20...