Lisa- are you watching videos or doing any streaming? That sucks the power out of my Toshiba (9 hour battery life). If I am strictly surfing/email I do get pretty close to the 9 hours on my Toshiba. I personally never changed any settings on mine, so whatever the factory settings are worked for me!
Oh, I also drained the battery all the way down right away and then gave it a full charge. I do recall it coming out of the box with just a short charge.