Don't get me wrong; I also think banning refuelling is a great idea, but I think the posts above imply that the drivers will be trundling around the track slowly most of the time, whereas actually the drivers themselves will be trying as hard as they can to maximise the performance they have available to them... I'd also be surprised if teams decide it is better to underfuel a car, considering that a very small amount of fuel gives you a lot more power. Also remember that the drivers can still change their tyres, so its only in the first stint that manageing tyres with high fuel loads will be much different from today's racing.
(Yes, I do remember F1 racing before re-fuelling. Also I happen to watch rather a lot of other categories which don't allow refuelling, and I've never found people just trundle around for half the race because they felt they would get a better overall race pace by going light on fuel).