We measure vehicle emissions in metric tons of carbon dioxide, the prevailing greenhouse gas emitted from gasoline combustion. The average emission per gallon of gasoline is .0089 tons of carbon dioxide and the average vehicle fuel economy is 22 miles per gallon, yet it these numbers vary between year, make and model of vehicle (Consevation.org). To track the annual emissions of one vehicle you proceed as follows:
Car Travel Emissions= [Miles driven per year/22 (mpg)] x .0089 (emissions per gallon)
To measure emissions for a particular vehicle you would substitute the “22 mpg” for the car’s specific fuel economy. The following link provides the math/methodology of how we derive the .0089 from the fuel combustion process:
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