How much CO2 is produced while burning one gallon of gasoline?

Burning one gallon of gasoline produces approximately 19.6 pounds (about 8.9 kilograms) of carbon dioxide (CO2). This figure can vary slightly depending on the specific formulation of the gasoline, but it is a widely accepted estimate. The combustion process releases CO2 as a byproduct of converting hydrocarbons in the fuel into energy.