I'll admit I do lots of skimming on the internet, newspapers, magazines, and other shorter type reads. My brain does a pretty good job of filling in the blanks. If something jumps out as interesting while I'm skimming, I'll slow down and reread it.
With books, I tend to read fast, but I don't skim. I often reread paragraphs or whole pages if things get deep. I don't feel like I miss anything and reading too slow would put me to sleep.
I guess I'm just not a good citizen.