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Poor Mileage on an 08 Fit

Old 06-24-2019, 11:39 AM
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Thread Starter
Join Date: Jul 2018
Location: Missoula, Montana
Posts: 6
Poor Mileage on an 08 Fit


My 2008 Fit Sport gets poor gas mileage 24-28 on the highway. It has an aftermarket Megan racing header and a cold air intake. The check engine light is on due to an 02 sensor code. I tried to change the 02 sensor with no change in mileage. Before I go and start buying new parts here are some questions I have:

Do I need a specific type of 02 sensor for the Megan Header (I just used the original model)?

Would it be worth reinstalling the original air intake and header?

Thanks. I just want this car to be a good, economical highway cruiser and don't need the added performance of the aftermarket parts.
Old 06-24-2019, 01:22 PM
5 Year Member
Join Date: Jan 2011
Location: Omaha, NE
Posts: 201
If you want to know for sure, return the car to stock, clear the CEL, and see if the fuel economy gets better and the CEL stays off. If so, you can then add one aftermarket part back at a time to figure out where the problem is.
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