I’ve had my GTI for 4 months now and still get excited at the thought of driving it 
There are quite a few optional extras for the GTI to look out for such as:
Monza II 18" Alloy Wheels
Leather Seats
Sat Nav
Highline Display
Multi Function Steering Wheel
Arm Rest (which can include a 6 CD changer or iPod Dock)
Rear Parking Sensors
Cruise Control
Sunroof
I get about 20-25mpg but I only do short journeys. You should be able to get 30-35 on longer journeys (dependent on if you get lead foot syndrome).
It’s a brilliant car, you will enjoy it 
I agree - had ours since December
