A Full Tank helps you Crank

On long rides, your endurance is often more affected by what you eat and drink (or don't eat and drink!) than by how well you've trained. No matter how many miles you've ridden in preparation, failing to keep the tank full will doom your efforts. So slug down several swallows of fluid every 15 minutes and eat about 20 grams of carbohydrate (about half an energy bar) every 30 minutes.