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CERTIFICATION GUIDANCE FOR ENGINES …
www.arb.ca.gov1 Engines regulated by 40 CFR Part 86 typically include engines used in on-highway applications such as heavy-duty gasoline fueled engines (HDGEs), heavy-duty diesel fueled engines (HDDEs), and heavy-duty engines using alternate fuels (CNG, LPG and LNG). Engines regulated by 40 CFR Part 89 include compression-ignition engines …