Just remember that your workout the day prior is burning up your store of glycogen, which is muscle fuel. However, the store is typically good for 12-18 hours, so a workout 24 hours prior to the event isn't as bad as a workout 12 hours prior. I experimented with this and found it to be true, 18 hours is enough time to top up the fuel stores, but 12 hours is a bit of a train to work through.
Remember to fuel your body properly with good carbs about 3-4 hours before the event, and then top up the tank just before you head out assuming the ride is two hours or longer. You can last 90 minutes before you truly deplete your glycogen (assuming a good pasta meal night before and fibrous carbs morning of), but two hours or more will require a bit more fuel, like a power bar or anything at 4:1 carbs
rotein.
An interesting fact I read recently: Fruit carbs fuel your brain and "survival" organs, wheat/grain/rice carbs fuel your muscles. Any excess fruit carbs turns into fat (but not that much fat, but away from the muscles), and excess grain carbs go to fat. But it is interesting to note that fruits are the basis of survival whereas nuts, grains, and rice fuel the body.