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Old 09-03-2014, 09:06 AM   #1
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Really Bad MPG

I have a 2003 mustang v6 and the gas mileage is terrible in it! It was at 12 MPG then I changed the air filter, fuel filter, plugs, wires, and oil change and that brought me to around 15 MPG. I then replaced the EGR valve and I am between 16 and 17 MPG now.
I drive mostly highway and do not drive that hard. Also there are not any vacuum leaks that I see and no check engine light
Any ideas on what I can do to find out the issue or what to change next?
Thanks!


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Old 09-03-2014, 01:47 PM   #2
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You did a pretty good tune up on it.. that mpg is absurd though. I don't know if this will do anything but clean up the throttle body maybe?

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Old 09-03-2014, 01:58 PM   #3
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Yeah it's killing me! I'll clean that sometime this week and see what that does.
Thanks!


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Old 09-03-2014, 01:59 PM   #4
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Sea foam it maybe?
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Old 09-03-2014, 02:06 PM   #5
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Sea foam it maybe?

I forgot to mention I did that about a week before the tune up.


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Old 09-03-2014, 02:15 PM   #6
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Honestly that suggestion is a shot in the dark. You have covered all of your bases

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Old 09-03-2014, 02:18 PM   #7
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Tbh I don't know what other 3.8 L V6's are getting but 17 doesn't seem that bad. Granted the S197 is a heavier platform, my old 06 4.0 V6 (with a CAI, tune, and true dual exhaust) only got around 17-19 mpg MAX. GT's get similar or better due to the fact that they produce more torque and can 'haul' around the heavy Mustang platform better (provided you keep your foot out of it... Which is 95% impossible).
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Old 09-03-2014, 02:27 PM   #8
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My gt gets that in town with me driving it like I stole it is why I thought the mpg was bad

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Old 09-03-2014, 02:39 PM   #9
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Clean your Mass Air Flow sensor and, depending on the miles on your car, you may want to consider replacing the Oxygen sensor as well.
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Old 09-03-2014, 02:58 PM   #10
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Clean your Mass Air Flow sensor and, depending on the miles on your car, you may want to consider replacing the Oxygen sensor as well.

Which oxygen sensor? Or all? Haha looking to save money where I can.


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Old 09-03-2014, 03:23 PM   #11
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Which oxygen sensor? Or all? Haha looking to save money where I can.


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Lol.
I hear you!

I'm not sure how many 02 sensors that the sixers have. My V8 has 4!
You only need to replace the "upstream" sensors though. The ones BEFORE the catalytic converter. The downstream sensors just tell the computer if the catalytic converter is working properly or not.
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Old 09-03-2014, 03:26 PM   #12
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Lol.
I hear you!

I'm not sure how many 02 sensors that the sixers have. My V8 has 4!
You only need to replace the "upstream" sensors though. The ones BEFORE the catalytic converter. The downstream sensors just tell the computer if the catalytic converter is working properly or not.
Should have two still

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Old 09-03-2014, 03:26 PM   #13
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Okay thanks! I'm pretty sure I also have 4


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Old 09-03-2014, 03:26 PM   #14
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Upstream that is

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