Can I estimate the emissions for a vehicle fleet if I only know the total number of miles traveled?
If you know the total number of miles traveled for a vehicle fleet by model year, you can roughly estimate the fleet’s emissions by using the Simplified Emissions Inventory Tool (SEIT). If you do not know the model year for the classes of vehicles in your fleet, you may estimate the CO2 emissions using the fuel emission factor for motor gasoline by assuming an average fuel efficiency for each class of vehicle in your fleet. You will also need to estimate the methane and nitrous oxide emissions for the vehicles using the emission factors by control technology. Please note that you will not be able to use estimates produced by SEIT for your emissions inventory on Form EIA-1605. The tool is intended to produce a “rough cut” of your emissions for the purpose of determining de minimis emissions or if an entity is a small emitter. Emissions inventories should be based on the methods approved by DOE as documented in the Technical Guidelines.
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