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No, the EPA does not dictate compliance measres, just the standards that have to be met, recordkeeping to demonstrate compliance, and what reports have to be submitted.
That said, they are quite aware of what emissions controls are available at any given time.
Soon or later the question becomes: "Is a tiny amount of environmental improvement (so tiny it is not likely to be measureable) worth sacrificing a lot of MPG?"
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2000 Ford F-350 SC 4x2 6 Speed Manual
4" Slam
3.08:1 gears and Gear Vendor Overdrive
Rubber Conveyor Belt Air Dam
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