. "Appendix D: Description of GREET and Mobile6 Models and Their Applications." Hidden Costs of Energy: Unpriced Consequences of Energy Production and Use. Washington, DC: The National Academies Press, 2010.
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Hidden Costs of Energy: Unpriced Consequences of Energy Production and Use
Mobile6.2 Heavy-Duty Truck Energy and Emissions Factors
The operational factors for heavy-duty vehicles were determined with Mobile6.2 and are shown in Table D-9 and Table D-10. Default Mobile6.2 values were used for these vehicles.
GREET and Mobile6.2 Comparison
The GREET vehicle operation factors can be compared against Mobile6.2’s to evaluate the accuracy of particular vehicles. GREET assumes default emission factors for conventional gasoline and diesel vehicles and the operating conditions of the vehicles is not transparent. Mobile6.2 is designed to model emissions from conventional fuel vehicles and low level ethanol blends and provides the ability to adjust many vehicle operation and fuel characteristics in determining emission factors. Table D-11 and Table D-12 compare the GREET default conventional gasoline and diesel vehicle emissions against Mobile6.2. The lack of transparency in the vehicle and operating characteristics used to generate GREET factors results in some difficulty in verification using Mobile6.2. In 2005, GREET assumes low-sulfur concentrations of 26 ppm in gasoline and 200 ppm in conven-
TABLE D-9 Mobile6.2 Energy and Emission Factors for Heavy-Duty Vehicles in 2005