Gas Mileage Getting Worse? - Mustang Evolution

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Old 01-01-2014, 06:40 PM   #1
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Gas Mileage Getting Worse?

I don't know if it's just me but I've progressively watched my mileage get worse as time goes by. I went from filling up once a week to three times a week and I've been driving the same amount. Is there anything that could be the problem? It's a 2002 V6.
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Old 01-01-2014, 11:44 PM   #2
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Aside from the normal tune up stuff, you could possibly have a oxygen sensor that is failing. It will cause the engine to progressively run richer and richer...
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Old 01-02-2014, 02:35 AM   #3
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I just recently replaced that actually! And I noticed a big difference but it started getting bad again.
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Old 01-02-2014, 02:39 AM   #4
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Quote:
Originally Posted by LadySleeper View Post
I just recently replaced that actually! And I noticed a big difference but it started getting bad again.

Fuel filter, spark plugs, etc?
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Old 01-02-2014, 08:54 AM   #5
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Did you replace all of the O2 sensors, or just one? Then there is still the fuel filter and tune up. When was the last time you did a fuel system treatment?
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Old 01-02-2014, 10:29 AM   #6
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Try changing gas stations and brands of gas used

The station your using cold be selling crap gas. Try a different brand and see what happens.
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