I tried some of the pointers on this thread, and if I read the meter right, I got around 55 MPG on the morning commute. Thanks! I'll see if I can beat that in the days to come.

YMMV.
Figured out the trick to going into EV mode, too. When I was going downhill (and I've repeated it) I let off the accelerator entirely then barely pushed it in. Viola, EV mode! I also accidentally managed to get the thing to go into pure-gasoline mode purely by accident using similar means (get it to go into gas + electric, then barely let off the accelerator)
EDIT: There's an info screen which shows if you're charging, discharging, running off gas, etc. You have to bring that up to know for sure if you're in EV mode. It's possible, but kinda pointless IMHO since you have to let the batteries recharge later anyway...