What's your tried and true eating plan for long rides? What do you eat the night before, 2 hours before, and during? Bicycling.com has some great tips, and there's the usual dinner of pasta, but I'm wondering if there's anything unique you've discovered?

I seem to crash a lot lately (feels like my blood sugar drops) even tho I've eaten well throughout the day. Somedays, I get about 10 miles and feel like if I don't have something, I'm going to die (well, maybe not die exactly). I don't remember it being this dramatic before beginning thyroid medication, but I could be wrong. Maybe I should just have 1/2 an energy bar before a ride regardless of how hungry I feel?

I'm doing a century in 2 weeks and the last thing I want to do is bonk after only a short distance.