My default upvote on comments/replies is 10%, which is well above the 2¢ dust cutoff. Sometimes I vote higher.
My default vote is 75% on top-level posts. I may adjust that up or down based on myriad factors including how much I plan to curate that day, how much I like the content, or just my petty subjective opinion about the effort in a post.
When my upvote gets high enough that 10% is well over dust level, I'll probably start upvoting good comments too. Until the recent rise in hive's value, I gave 100% to almost all published posts that I liked (unless they'd already earned a lot), but have reduced that to 75% for many of them now. I love to upvote small, new accounts, who will get a warm and fuzzy from my whopping (to them) ten cent upvote.