So I just got a 2012 Prius Two, upgrading from a 12 year old Camry, and I'm trying to figure out the best way to do things. I've been poking around looking at some of the tricks to maximize MPG's, especially keeping the car in stealth mode 25 < x < 45 MPH (or so, basically looking at the bar and looking for EV mode to pop up). I commute on a lot of back roads to work, a 40 minute or so drive, with some hills, stop signs and stop-and-go traffic. My question is: once the engine is warmed up, wouldn't it be beneficial to switch the car to EV mode only for the initial acceleration at stoplights or stop signs? I'm new at this, but I would imagine that if you can put up with the lower level of acceleration (it does kick you out of EV mode sometimes due to that), you should be able to really save a lot on that initial "kick" of gas to get the car from 0 MPH to 25 MPH. I'm guessing, with my high-school-level knowledge of physics that the amount of power to push your hybrid from 0-25 would well exceed the amount of power required to charge the battery along with gas-powering the car for that distance. When the car is "warming up", it kicks you out at 10 MPH if it allows you to do it at all, so all this is moot unless you get up to that magical 5 minute threshold, I think.