ok... I have an old Murray mower that I got from a friend. The mower was not cutting my St Augustine clean, so following the advice here, I replaced the blade.

After a few days I mow the lawn, I still observe that the tip of the leaves aren't cut clean. It looks as if the blade ripped the top portion rather than cut it.

So, I went to my neighbors'. Theirs is cut cleaner than mine.

Do you think I'm pushing the mower too slow? too fast? or should I just get a new mower?