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Same effect as most HAI. It reduces the amount of power you have and therefor automatically makes you drive more eco friendly just because. . .well you can't do anything else.
It's like bob said, if you stick a really big block of wood under your gas pedal its just as eco friendly. It keeps you from using fuel. Does not in anyway actaully improve efficiency just reduces driver waste at best. The gains will be minimal if anything because you are inducing extra restriction and therefore pumping losses on the engine.
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