How much CO2 equivalent comes from a gallon of gas?

The combustion of one US gallon of gasoline in a passenger car results in emissions of 8.872 kg CO2(e). At standard pressure and 15 °C (59 °F) the density of carbon dioxide gas is 1.87 kg/m3. 8.872 kg occupies a volume of 4.744 m3 (167.6 ft3) which would fill a cube 5’ 6” high or a sphere 6’ 10” across.

Source: Greenhouse Gas Protocol ( tools) accessed via AMEE:…col/data/passenger%20car/gasoline/2005- present/result/none/1.0/1;gal?usage=byFuelOnly