Unless your use to running on the edge with CR it's probably better for most to give themselves a bit of a safety margin, especially since point of CR gives a fairly small reward hp wises, eg. around 3%.
I did mention to these ppl I spoke to ATT, I thought I was getting close to the edge for pump fuel or at least a decent safety margin. They strongly disagreed, I understand why but there’s a point where it becomes impractical & risky.