The weird grumble noise or whatever you wanna call it, I felt it a few times as normal, but I noticed that when I took a longer stop, it wasn't there after, or it was much less noticeable. I've experienced it on my quick stops in the morning, but now that I think about it, I don't experience it at stop lights often. Just thought it was cool that the transmission worked smoothly.
I noticed this when I was doing some slow cruising around town, taking the residential roads with lots of stop signs, but no traffic to keep up with, so I didn't have to nail the gas too hard, ended up with around 31-32 mpg. Not bad considering I've been getting mid 20s all week.