GHG Vehicle Test Group
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GHG Vehicle Test Group means vehicles that have identical test group, vehicle make and model, transmission class and driveline, aspiration method (e.g. naturally aspirated, turbo-charged), camshaft configuration, valvetrain configuration and inertia weight class.
Since the 2001 model year, light-duty vehicle engine families are known as "test groups" [1] . There are many different test groups; for example, the Ford F-150 could have 10 or more test groups, depending on the engine size, gross vehicle weight, and drivetrain of the vehicle.
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