I was playing around with the automatic transmission in manual mode this morning. I've noticed that around 60mph, if you want to accelerate, it will drop down to 5th or 4th dependng on how hard you push down on the accelerator. I was thinking, for better gas mileage, I'd like to leave it in 6th gear as much as I could, even when trying to accelerate, so I tried the manual mode. Found out a couple of things. One, when in manual mode and slowing down to a stop, it will down shift automatically, as if in auto mode, meaning you don't get engine braking like you would if you down shifted manually. The second thing I found was it won't let you upshift to 6th under 40mph. I would assume it won't let you upshift into 5th around 30mph.