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Old 08-29-2011, 01:05 AM   #1
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2004 Mustang MPG Problem

I am new to this forum. I been using it for a lot of info and figured to join since I am always on here. I just bought an 04 v6. The first tank of gas I had I got 10 mpg, second 14 mpg, and my last 16 mpg. This is a ratio of 75% highway and 25% city. I am trying to figure out the reasons why I am getting such bad gas mileage. I already replaced the oil, oil filter, and air filter, and the car is is great mechanical shape. Any suggestions?
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Old 08-29-2011, 05:42 AM   #2
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Re: 2004 Mustang MPG Problem

Mods? Tuner? What kind of fuel are you using? How heavy is your foot? Tire pressure? How well / poorly does it run (cough sputter miss)? Automatic/Manual?

There are far too many variables to consider without a few more details.
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Old 08-29-2011, 07:01 AM   #3
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Re: 2004 Mustang MPG Problem

Quote:
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Mods? Tuner? What kind of fuel are you using? How heavy is your foot? Tire pressure? How well / poorly does it run (cough sputter miss)? Automatic/Manual?

There are far too many variables to consider without a few more details.
I am using 89 octance, I do not have a heavy foot unless passing, tires are brand new, and it an automatic. This morning I did notice it idle a little rough.
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Old 08-29-2011, 07:40 AM   #4
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Re: 2004 Mustang MPG Problem

check the basics, vacuum lines, make sure all intake hoses are tightened, possibly stopped up EGR valve (though i dont know if that year still had one)
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Old 08-29-2011, 10:38 AM   #5
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Re: 2004 Mustang MPG Problem

make sure you are calculating it right, filling up 100% driving, then filling up and doing the math like that~ I am sure you are but just FYI as 10mpg is VERY bad... you should be seeing at least 18-20

a tune up is a great idea, also its how you drive as well as where you drive (always flooring it or driving city vs highway). Also, is it going into overdrive, whats your rpms at 55-60mph?
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Old 08-29-2011, 04:30 PM   #6
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Have you checked the fuel filter?
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Old 08-29-2011, 09:36 PM   #7
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Re: 2004 Mustang MPG Problem

I'd suggest running 91+ through it and also having a Fuel Induction Service done on it. They will clean and inspect the EGR, Intake manifold etc. Most Ford Dealers will do that for 119.00 or less. I think the last time I looked here it was 99.00 at my local dealer. I get 19.5 out of my 06 V6 and drive daily about the same percentage city/hwy at 70 to 75MPH on the highway. Avg in town speed is about 35mph.
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Old 08-30-2011, 11:09 AM   #8
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Quote:
Originally Posted by goherd
Have you checked the fuel filter?
+1 for fuel filter. If you are using ethanol blended gas and it's a daily driver be prepared to change it yearly. There is no need to run premium gas in a stock V6 Mustang as it does nothing for it. If it is a high mileage car then you might think about getting the fuel system serviced. If it's not then also put new plugs and wires in it. Also look at getting your tranny flushed. Not just fluid dumped but an actual flush. Chances are it's never been done.
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Old 08-30-2011, 12:31 PM   #9
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Haha thanks for reminding me my fuel filter might need to be changed. I knew there was something I was forgetting to do
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Old 08-31-2011, 08:47 AM   #10
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Re: 2004 Mustang MPG Problem

Wow I sit around 22-24 in town, I take regular trips of all highway and I get 28-29. Hell my 5.0 explorer get 18 around town and she just hit 190k. You should be getting much better than what you are, +1 on having the fuel system serviced. Check plugs, and filters. Since it's an auto when was the last time that was serviced? Was this the first time you had a rough idle or has it been doing that for a while?
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Old 09-01-2011, 11:13 PM   #11
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Lowering spring,Cai,tuner will help you plus a shift kit I get 33+ on the highway if I got like 70 miles per hour
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Old 09-04-2011, 12:28 PM   #12
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Spark plugs, air filter, plug wires, coil pack, fuel filter and air pressur in your tires. Check all those. I replaced all those an I have a heavy foot and I'm getting 19
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