I just went on an "easy" bike ride - 6 miles out, 6 miles back, but the heat index here is 105 and of course I went at noon (I was headed into the bike shop for an adjustment on the bike...and meant to go earlier...but couldn't go later...so...yea).

When I started out my legs felt more leaden than usual. I was a little worried. I drank a ton, and headed to the shop...on the way back, I almost felt like I needed fuel. Normally, I don't feel like this on anything less than a 20 mile ride, but on this one...I just felt...de-fueled. I drank plenty of water (emptied both of my sportbottles). Made it back in record time, thanks to the adjustment that was performed on my bike, but man was I starving and feeling a bit on the weak side.

Does your need for fuel increase the hotter it is? Or was I just dehydrated and didn't know it?