CO2 from a Gallon of Petrol

If a UK gallon of fuil wieghs approx 3.4 Kg how come it now coverts when burmt into 10.6 Kg of CO2 ? or am I missing something here where - does the extra mass / weigh come from ?

CO2 emission from a gallon of Petrol

The extra mass is taken from the oxygen (O2) in our atmosphere. We have several explanations and comments about this so called oxidation process on our website:

How much CO2 does one liter of petrol produce?

How to calculate the CO2 emission of burning fuels

See also the other comments in the above mentioned threads.

Juerg