The use of the term 4G is a bit of a misuse in terms really, it's more in the lower realms of HSPA+ the 14/7mbps standard (can't recall the exact numbers off the top of my head) however it's performance on cellular data networks is indeed an improvement over the desire and other HSDPA devices.
Yeah I know about all that but I'm getting about 3-4 mbps down and 1 up right now in the middle of Oklahoma so I'm happy even if it isn't truly 4G.
I'm using Advanced Task Killer and it seems to be improving battery life somewhat.
And yeah I noticed it was my WiFi that was getting lower and not the cellular as much. Not a big deal though. Never cuts out.