Originally Posted by koala logs

Called "carbo-loading".

Eat lots of carbs the night before the big ride and another huge carbo meal 2 to 3 hours before the ride. Ofc, the time you take the big meal before big ride can be different per individual. For me I take big carbo meal less than an hour before a big ride.

Together with carbo loading, you may also "hyper hydrate" the day before and an hour before the ride - as long as neither thing makes you bloated. It helps extend your supplies or make less stops and generally improves your chances of not bonking the ride. But do pay careful attention to your body. Don't forget to eat and drink and if you run out of food or drink, then make a food and drink stop. It's better to be delayed a bit if you made a much needed food and drink stop than try to make it to the finish line sooner but feel miserable afterwards.