Seems you can share a Prius in Philadelphia. If you want to try one out before purchasing - or this may be all ya need.
This was a news feature on the Philadelphia abc tv station last night.
Showing Toyota Prius squeezing thru the narrow streets of old Philadelphia, (parking the vehicle was noted as a big plus!)
... "PhillyCarShare is a Philadelphia-based non-profit organization dedicated to reducing automobile dependency in the Philadelphia region through community-based car sharing improving neighborhood livability; increasing transit ridership, walking, and biking; improving air quality; promoting economic development; mitigating development; mitigating parking demand; and increasing accessibility while alleviating the burdens of auto ownership.
Improves air quality. PhillyCarShare uses hybrid gas-electric vehicles. Users can reduce their auto emissions by 94%!" ...
see web site:
http://www.phillycarshare.org/html/vision_mission.htm