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I know on most US 1993-2003 GM 3.8 V6s (3800) the EGR being disabled will drop cruising by 1-4MPGs. Deleting it is easy also remove the bolt holding the EGR pipe to the Lower Intake Manifold block the hole with something (tap and plug) do the same to the other end of the pipe and unplug the electrical connector, then ignore the check engine light.
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 I move at the speed of awesome.
"It's not rocket surgery!" -MetroMPG
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