I love it when the miles range goes up by 5 during a journey (using Tesco 99 Ron Super Unleaded and doing 70mph all the way); which means time for a quick blast on the roads.

(Yeah, I know, with a GTI I shouldn't be worried about petrol consumption.)
From my experience, I've also found the onboard CPU miles range fairly accurate through sensible driving, even down to the last 15 miles in the tank.