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Tier 3 Certification Fuel Impacts Test Program
Tier 3 Certification Fuel Impacts Test Program. U.S. Environmental Protection Agency, Washington, D.C.
The report will ultimately be referenced in a new rulemaking that will make adjustments to the test procedure.
The recent Tier 3 regulations for light duty vehicles introduced a new certification fuel designed to be more characteristic of current market fuels. A laboratory test program was conducted to measure differences in CO2 and fuel economy between the current and future certification fuels, to be designated as "Tier 2" and "Tier 3," respectively.