Keep in mind... it is new to you... and you are still excited. And can't put the thing down.
You are not using it... how you would a normal phone.
I have an Evo... and get more than 20 hrs. I have only 4G and bluetooth off.
Your phone should be more power effecient.
DropBox: register for free space (we both get extra space): http://db.tt/sWYVl3j6