# Where: TE

# = total emissions of CH_{4 }or N_{2}O from mobile combustion

# EF

by vehicle type, metric tonnes per year = emission factor by vehicle type and fuel type provided

in Appendix A, g of CH_{4 }or N_{2}O/mile

Mileage = total miles traveled by vehicle type, miles per year 0.000001 = conversion factor to convert grams to metric tonnes

# (A)

If mile traveled data are not available, the operator may elect to back calculate total miles traveled by vehicle type from fuel usage data using U.S. EPA fuel economy values for specific vehicle models and the following equation:

n Mileage = ∑ Fuel_{i }* (FE_{city,i }i Where:

*

DP

_{city,i }

+

FE

_{highway,i }

*

DP

_{highway,i }

)

# Mileage = total miles traveled by vehicle type, miles per year

# Fuel_{i }

= volume of fuel consumed by vehicle model i,

gallons per year = U.S. EPA specified vehicle i fuel economy for city driving, miles per gallon = proportion of miles traveled spent in city driving for vehicle i, percent/100 (0.55 may be used as a default value or a fleet specific number may substituted if known) = U.S. EPA specified vehicle i fuel economy for highway driving, miles per gallon = proportion of miles traveled spent in highway driving conditions for vehicle i, percent/100 (0.45 may be used as a default value or a fleet- specific number may be substituted if known) = number of vehicles FE_{city,i }DP_{city,i }FE_{highway,i }DP_{highway,i }n

(j) Method for Calculating Fugitive CH_{4 }Emissions from Coal Storage.

The operator shall calculate fugitive CH_{4 }emissions from coal storage using the following equation:

# CH_{4 }= PC * EF * CF_{1 }/ CF_{2 }

Where CH_{4 }= CH_{4 }emissions in the report year, metric tonnes per year PC = Purchased coal in the report year, tons per year EF = Default emission factor for CH_{4 }based on coal origin and mine type provided in Appendix A, scf CH_{4}/ton

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