Yes for a 3000kJ ride I would pack 1500 cals of carbs, something like:
- 500 calories from two bottles of Gu Roctane
- 500 calories from two Cliff bars
- 500 calories from 5 dates/figs/bananas
On the bike its either one bottle of water and one bottle of Roctane, or later in the ride two bottles of water. On a 3000kJ ride like that, at endurance pace, would need to refill water bottles twice on my 90 mile route.