These numbers represent the estimated pounds of CO2 emitted per year for a typical electric car driven in each region. Even an electric car in the “worst” region yields cleaner emissions than a typical conventional gas car, whose CO2 emissions do not vary by region. The calculations assume 12,000 miles driven annually (a typical year’s worth of driving), and the emissions figure for gas-only cars assumes a fuel efficiency of 25 mpg. The Nissan Leaf’s on-road efficiency serves as a representative value because the Leaf best represents the mainstream electric-car market at this time.
SOURCES: U.S. ENERGY INFORMATION ADMINISTRATION, U.S. ENVIRONMENTAL PROTECTION AGENCY