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Cold intake air improves the power developed but reduces the fuel efficiency. At higher speeds and higher air flows the throttle body will chill and the intake air will cool slightly, leading to poorer economy.
Perhaps at low speeds the extra power available helps to improve the fuel consumption especially as the throttle body won't be chilled as much.
The thing is, if this mod has improved OVERALL fuel economy then good. If not, reconnect the pipes.
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