That doesn't sound good.
My unlocked Pre2 has been in my pocket since about 9am, and I'm at 86% (it's also 1pm). This is from driving to work (WIFI at home and WIFI at the office) with less than 1/2 hour for the travel time.
I've had some days that the WIFI appears to be problematic and it does run my battery down a lot faster.
Main variants that will affect your battery are:
1) screen brightness, turn it as low as you can that's still comfortable for you.
2) email updating, set it to manual or for longer periods (every 10-30 minutes or longer, I've just set mine for 1 hour for all my accounts)
3) don't have GPS running all the time, or any other apps that needs to check itself online on a constant basis.