Do you have to charge the battery? How and where?
The only time that you notice any difference is when you are stopped - the gasoline engine actually shuts off. NOTE: If you are sitting at a stoplight with the engine running you are getting zero mpg. As soon as you take your foot off the brake pedal, the engine re-starts instantly and off you go.
Regenerative braking is used to re-charge the battery pack.
The only sacrifice is that the rear seat does not fold down (they put the battery pack there).