I drove over to Glasgow on Friday evening, and the M8 was quite busy. I was forced to drive economically, and even though the car is still young (about 1,000 miles) and a DSG, I was averaging 40mpg.
It does dip if you get enthusiastic though.
I also would wish for a bigger tank. The Peugeot took about 63 litres and I could rely on 400 miles to a tank, often 450, occasionally pushing 500 if I'd been really economical. Not a hope in the Golf, although obviously it's cheaper to fill the smaller tank.
Rolfe.