<"A factory-installed plug-in hybrid option — though I wonder if tapping a coal-powered electrical grid improves the Prius's carbon footprint that greatly.">
There is a way around this. I am in the process of going Solar Power to the grid with an eye towards purchasing this plug in Prius in 2 years. That means I am putting up a more powerful electrical solar power system to take into account the future load requirements of a plug in hybrid. If what I read is true, a 100 to 150 MPG or more is possible as long as the gas engine operation is minimized. By the way the efficiencies of solar panels are increasing as solar panels are decreasing in size to the point a solar powered vehicles are just around the corner. Lets all give the Middle East and the big oil companies the one finger salute!!