Originally Posted by emsr2d2
I follow the same inconsistent "rule"!
1. He, too, loves his stepdaughter.
2. He loves his stepdaughter too.
For me, it comes from considering "too" at the end of a sentence as "as well". I certainly wouldn't write "He loves his stepdaughter, as well". I would write "He loves his stepdaughter as well."
However, it's interesting that I consider it to mean "also" yet, unlike my sentence #1 above, I would use "He also loves his stepdaughter" without the commas that I would put around "too".
There is a pause when saying "too" in the middle that there isn't when you say "also."