Shrug. I use all the data.
If there's a break I want to gauge my ability to get across and still be able to stay in there when I get there. I also find it to be a good gauge when I get into the sweet part of the race for me (final 15-20 minutes) and gauge how much I've dug into my reserves and how much I have to do something exceedingly hard like a solo, late bridge, break initiative.