The thing is... we DON'T all have the same settings by now.
I leave BT, wifi, background data, active-sync of three email accounts, facebok, etc AND GPS on full time and have my screen on auto-brightness. I get 12 hours of moderate use (20-30 mins of navigation+playing music through the 3.5mm jack, pandora with the screen off for 5-6 hours, 600-1000 txt messages[i know, i have a problem], as well as emails, facebook, twitter, browsing forums so on and so forth) and up to 2 days or so (probably around 35-40 hours) if I only use the phone for a few text messages and phone calls.
I have had this experience on two different evos now, with the stock battery on both, and with two ebay batteries.
Oh, and now that I have rooted and rommed with an undervolted kernel... I haven't seen my battery drop below 50% with leaving my house at 8am and plugging it in at 6pm when I get home.
Maybe try something along those lines?
The only other problem with battery life I ever had was due to an SD card error... dropped my battery life to 3 hours for all the batteries. Did you try wiping and re-formatting your SD card? I know it sounds stupid... but it's usually just the one little thing which is overlooked that causes catastrophic failure.