bad gas mileage?

2006 CHEVROLET HHR
76,000 MILES • 4 CYL • FWD • AUTOMATIC
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AARONCAVY
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I have lost considerable gas mileage over the past few months. I usually get 400 miles on one tank, I am almost at half a tank and its almost at 100 miles. When I rev the car I hear something different like something is lose. I would like to know what could be the cause of losing such considerable gas mileage. I have had the fuel filter, air filter, and tires changed in August so this cant be the problem. I think it could be the exhaust? Let me know what you think it could be.
Sep 28, 2010 at 11:32 AM
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HMAC300
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have the engine scanned for codes, most auto parts stores do this for free or you can use this guide.

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

if it 's the exhaust you need to put a vacuum gauge on it to tell. I'd bet you have a MAF sensor that is bad and is why your mileage is dropped so dramatically.

You can check the catalytic converter using this guide.

https://www.2carpros.com/articles/how-to-test-a-catalytic-converter

Check out the images (Below). Please let us know if you need anything else to get the problem fixed.
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Dec 16, 2010 at 3:59 PM