Do not inlcuded vehicles acquired under the "functional needs" exception.

An agency should maintain records documenting the use of this assessment tool, including its EISA GHG emissions 

limit and aggregate GHG emissions for reporting purposes. 

* An agency should enter FFVs in the columns marked Alternative Fuel (for car or trucks) if they will 

operate the FFV on the alternative fuel. Otherwise, the vehicle should be inlcuded in the passenger car 

or light-duty truck column that corresponds to Gas/Diesel/CNG.

READ ME for EPA's Federal Vehicle GHG Emissions Assessment Tool

How to use the GHG Emission Calculator

To start using the Federal Vehicle GHG Emissions Calculator: 

1. Go to the U.S. EPA's Green Vehicle Guide, which can be found at www.epa.gov/greenvehicles and retrieve 

your vehicle's GHG scores.

2. Enter the total the number of vehicles you plan to acquire within each GHG score bin (e.g., GHG score 7).

3. Enter passenger cars, FFV passenger cars, light-duty trucks and FFV light-duty trucks separately, since these 

vehicles must achieve different GHG scores to be considered low GHG-emitting vehicles. 

4. The calculator will run a tally to determine your agency's aggregate GHG emissions and your agency's EISA 

limit, which is calculated based on the total number of light-duty vehicles and medium duty passenger vehicles 

your agency acquires or intends to acquire.

To satisfy the EISA § 141 certification requirement, the head of an agency, or his or her designee(s), should certify 

that the Assessment Tool properly and accurately accounts for all applicable motor vehicle acquisitions completed in a 

fiscal year or other acquisition cycle specified by the agency. 

* For purposes of this Assessment Tool, the column marked Gas/Deisel/CNG should include vehicles 

operated with gasoline, diesel or CNG.

To quantify emission reductions associated with reducing vehicle miles traveled, modify the average annual mileage 

value used.

Section 141 applies when a vehicle is acquired; therefore, EPA recommends that an agency calculate its EISA GHG 

emissions limit and aggregate GHG emissions when developing its annual acquisition plan.

An agency's GHG emissions limit and aggregate GHG emissions will update as vehicles are added to the tool. 

5. The calculator will then tell you if you comply with EISA section 141 or if you owe additional GHG emission 

reductions. 

If you're considering battery electric vehicles: At this time, because they have no tailpipe emissions, all battery electric 

vehicles should be included in the the bin that corresponds to a GHG score of 10.
Gas/Diesel/ 

CNG Alternative Fuel Gas/Diesel/ CNG Alternative Fuel Gas/Diesel/ CNG Alternative Fuel Gas/Diesel/ CNG Alternative Fuel

10

9876543210

Totals: 0 0 0 0 0.0 0.0 0.0 0.0 Aggregate: 

EISA Limit: 0.0 0.0 0.0 0.0 EISA Limit: 

Difference: 0.0 0.0 0.0 0.0 

Results:

583629675399445491

(grams/mile)

Avg. CO2e 

emissions

537

Greenhouse Gas Score 

Criteria

215261307

Federal Vehicle GHG Emissions Calculator

You 

Annual GH

GHG 

Score

# of Cars # of Trucks Cars (Metric Tons) Trucks (Metric Tons)

353

CO2 Equivalent Performance

Average Annual Mileage:

10,000 6,000

Cars Trucks

Enter the number of cars/trucks acquired by your agency:
Footnotes for GHG Emissions Calculator

[(CO2 grams/gallon) x (gallons/# miles)] + [(CH4 grams/mile+ N2O grams/mile)]

The Annual GHG Emissions Summary should be used to the determine the quantity of GHG emissions owed pursuant 

to the "alternative measures" exception provided for by EISA § 141. 

The CO2e emissions were calculated using the following equation:

CO2e values are calculated based on the CO2e values for each fuel type.

The EISA limit is based on the median CO2e emissions that correspond to a GHG Score of 7 for non-FFV passenger 

cars, 6 for FFV passenger cars, and 6 for non-FFV light-duty trucks, and a 5 for FFV light-duty trucks. 

The Average Annual Mileage is based on GSA's Federal Fleet Report, Fiscal Year 2008 (Jan. 31, 2009). GSA 

considers passenger vehicles to be sedans, station wagons, passenger vans and SUVs; trucks are light duty, medium 

duty and heavy duty. EPA considers passenger vans and SUVs to be light duty trucks. The average annual mileage 

used in the assessment tool is derived from Section 4-2, Average Miles Per Vehicle, for passenger vehicles and trucks. 

The median CO2e values for GHG scores 0 and 10 are the median values of each score and what would be the next 

score above a 10 and below a 0, if those scores existed.