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Re: P0420 and fuel economy: Huh?
Posted to Technical Theory Forum on 5/21/2011 13 Replies

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I have a P0420 on my 04 RSX right now. Since the code, my MPG has dropped to 25mpg. Really odd. Ive owned the car for 4 years and have always gotten around 30 mpg [...] sure there is no way a P0420 c... Login to read more.

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