If it is like a Prius, the engine is on when you run the A/C and the heat. As long as you are in "window down" weather you can save some money tho. I really was serious about making my Prelude electric. It is just a Civic in a sport jacket so there are kits available. Unfortunately when I ran the numbers, I don't drive far enough a month to make any economic sense and when I do go somewhere (usually Tampa, 150 miles away) it is too far.
If we could get FPL to let us use our golf carts on the easement and cut a short access path to the neighborhood behind the strip mall I shop at, I wouldn't use my car much.
Most of my daily trips are about 5 miles total and would be about a mile each way if I could go down FPL.
