New 3g owner. Normal sounds?

Hi! Just got a 2010 Prius II with 90k miles on it. I'm currently getting 37mpg around town. The previous owner averaged 50mpg over the last 20k miles per the trip computer. The dealer put on regular nexen tires...not LRR as would be expected. I'm wondering what else they did...but hey, even 37 is good compared to the 16mpg I'm used to. So just curious, what kind of noises are normal in a prius? I figured out the battery fan in the back seat already. There is quite a bit of whining/maybe even roaring when turning..but it doesn't feel like a wheel bearing. The car is ungodly slow coming away from stoplight or stopsign and doesn't respond to pedal movement much unless in power mode. If I push it harder, the ICE kicks in and it moves like a normal car...but I otherwise try to keep it at the halfway mark on the eco meter and certainly out of the power range. I otherwise have all but 1 bar on the battery meter and it's a great car! I've been reading the forum and checking out other people's experiences. I just want to make sure I'm good before the 30 day guarantee is up.