I'm just wondering what are some of the general guidlines in the best way to max mpg in my new Prius Plug-In. Typically I have a about 90mile round trip commute to/from work a day. I live approx 4 miles to the closest freeway enterance and I work approx 4 miles from my freeway exit. What I've been doing is using EV mode to & from the freeway & then switching to Hybrid mode by turning off the EV mode manually while on the freeway. That means I do about 16miles of OFF freeway driving of course. Is this the best stratedgy? Should I just leave it in EV mode since it automatically switches to Hybrid mode when approching around 35-40mph or at higher rpms? Just trying to get the best bang for the buck.