Holy cow! Hypermiling tips work!
The hypermiling guide I referred to in the previous post turned out to be right! After 6 months driving my car, this article has done more to improve my mileage than all the experimentation & coasting I've tried so far. The best tip turned out to be "EV-glide mode" - a sweet spot on the acceleration curve where only the electric motor is engaged. Using this technique, I went from 43.4 to 46.2 mpg on my commute home tonight! Granted, I'm only about 75 miles into the tank, but at this rate, I expect to hit closer to 48 for the tank average. I can't wait until my next fresh tank to really push the limits!