This page provides information on calculation methodology, assumptions and sources of data.

Calculations

Auto CO2 Emissions

Emissions = (2 x the one way trip distance x the number of auto trips per week x type of auto CO2 emission factor x number of weeks in a school year) / the number of carpool passengers

Bus CO2 Emissions

Emissions =  (the one way trip distance x the number of bus trips per week x bus CO2 emission factor x number of weeks in a school year)

Total CO2e Emissions

Total CO2 Emissions = auto CO2 Emissions + bus CO2 Emissions

Distance Calculation

Walk Distance =  the one way trip distance x number of waking trips per week x number of weeks in a school year

Bike Distance =  the one way trip distance x number of bike trips per week x number of weeks in a school year

Auto distance = 2 x the one way trip distance x number of auto trips per week x number of weeks in a school year

Bus distance =  the one way trip distance x number of bus trips per week x number of weeks in a school year

Fuel Use Calculation

Fuel use = Auto distance x selected auto type fuel efficiency rating;

Calories Calculation

Calories burned = (Walk distance x walking calories per kilometre or mile) + (Bike distance x biking calories per kilometre or miles)

Fuel Cost Calculation

Fuel Cost = Cost of fuel per litre or gallon x fuel use

Fuel use and CO2 Emissions Coefficients
Source: NRCanada 2011 Private Vehicle Fuel Efficiency Guide using the city driving fuel efficiency and emissions coefficients.
http://oee.nrcan.gc.ca/publications/transportation/fuel-guide/2011/energuide-label.cfm 

Hybrid – Based on a 2011 Honda Civic with a 1.3 litre engine
Litres per kilometre = 0.047, CO2 emission factor = 0.104
Gallons per mile =  0.020, CO2 emission factor = 0.371

Compact – Based on a 2011 Toyota Corolla with a1.8 litre engine
Litres per kilometre = 0.078, CO2 emission factor = 0.156
Gallons per mile =  0.033, CO2 emission factor = 0.557

Midsize – Based on a 2011 Nissan Altima with a  3.5 litre engine
Litres per kilometre = 0.104, CO2 emission factor = 0.207
Gallons per mile =  0.044, CO2 emission factor = 0.739

Fullsize- Based on a 2011 Ford Taurus with a 3.5 litre engine
Litres per kilometre = 0.117, CO2 emission factor = 0.223
Gallons per mile =  0.050, CO2 emission factor = 0.796

Minivan – Based on a 2011 Dodge Grand Caravan with a 3.3 litre engine
Litres per kilometre = 0.122, CO2 emission factor = 0.237
Gallons per mile =  0.052, CO2 emission factor = 0.846

Truck – Based on a 2011 Ford F150 FFV with a 5.0 litre engine
Litres per kilometre = 0.139, CO2 emission factor = 0.276
Gallons per mile =  0.059, CO2 emission factor = 0.985

SUV – Based on a 2011 Chevrolet Tahoe with a  5.3 litre engine
Litres per kilometre = 0.144, CO2 emission factor = 0.281
Gallons per mile =  0.061, CO2 emission factor = 1.003

Bus – Based on a typical transit bus with averaged ridership
Source, Translink BC;

Metric CO2 emission factor = 0.0586
Imperial CO2 emission factor = 0.209

Other Coefficients list:

Calories burned per kilometre walked = 27;
Calories burned per mile walked = 43;
http://walking.about.com/library/cal/uccalc1.htm

Calories burned per kilometre biked = 11;
Calories burned per mile biked = 18;
http://www.sparkpeople.com/resource/calories_burned.asp

Note: The calories burned values in the iPad version 1.0 are incorrect and will be updated to these values in August 2012.

Weeks in a school year = 37;

Default fuel cost per litre = $1.40;
Default fuel cost per gallon = $4.00

 

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