This document summarizes a symposium on car sharing in 2016. It analyzes data on car sharing in 177 cities across 5 European countries. The top cities for car sharing per capita are Karlsruhe, Utrecht, and Amsterdam, while the top cities for total shared cars are Paris, Berlin, and London. Key factors influencing car sharing adoption in a city include country, city size, education levels, environmental attitudes, public transit usage, and presence of other shared transport options. P2P car sharing is also influenced by a city's history, while B2C car sharing correlates with education, environmentalism, and bikesharing/university presence.