I'll be taking a stab at Haleakala uphill tomorrow. I plan on starting at round sunrise and plodding along until I hit the top. I've read all I can find about it, including a thread below. Hopefully I've learned something.
I was going to do it today but the radar showed rain all the way up. It'll be hard enough without having to start in the rain. If the weather doesn't cooperate tomw I guess I won't get chance, I have to return the bike and I go home on Wednesday.
I'll report back when I'm done, one way or the other.