Total CO2 Produced =
Driving Miles Traveled / Miles per Gallon * CO2 Produced per Gallon Burned

Driving Miles Traveled
First, we calculate the distance between the ‘from’ and ‘to’ locations you entered. Then, we add a 15% mileage factor to account for the non-linear nature of roads. Or, if you entered an ‘actual mileage’, we use that number.

Miles per Gallon
If you selected a car size, the following fuel efficiency values are used in calculations:

• Small/medium car: 22.4 mpg based on 2006 average US passenger car fuel efficiency [U.S. Department of Transportation, Federal Highway Administration, Highway Statistics (Washington, DC: Annual issues), table VM-1]

• Large car: 18.0 mpg based on 2006 average other 2-axle, 4-tire vehicles [U.S. Department of Transportation, Federal Highway Administration, Highway Statistics (Washington, DC: Annual issues), table VM-1]

Or, if you entered an ‘actual economy’ (mpg), we use that number.

CO2 Produced per Gallon Burned
19.56 pounds of CO2 are produced for each gallon of gasoline burned [GHG Protocol Direct Emissions Tool v1.0]



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