I've had every evo (OG, shift, and 3D), and the design by far has the worst battery out of all of them. The phone is stock, I've had the battery tested, and it checks out good. I lose 10% on my ride in to work from a full charge (spread out over OS, display, bluetooth..). By lunch I'm down to 60%, and on the ride home I have to throw it on the charger as it's down to 50% or less. This is with very minimal use throughout the day.
A friend of mine is seeing very similar results on battery performance. It's pretty disappointing.