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Old 11-21-2013, 12:10 PM   #1
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Gas mileage

Just bought my 1st mustang, 2004 convertible GT, automatic, and it didn't take but 55 years. Authough I love the power, my #1 wanted upgrade if fuel improvement. Gone are the days of going out on the weekend looking for a race. Anyone have any sugestions on the path I should take? Not sure if she has any upgrades, bought from a dealer.
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Old 11-21-2013, 12:14 PM   #2
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Upgrade to a CAI and tuner.
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Old 11-21-2013, 12:16 PM   #3
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What sort of gas mileage are you getting right now? I used to average 17mpg city before I developed my misfire. Do you do a lot of city or highway driving? It's always a good idea to start with a tune up

Also welcome to the Forum!! Post up some pictures
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Old 11-21-2013, 12:21 PM   #4
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JDF. Don't know. Just got her 3 days ago. Havnt put 100 miles on it yet.

---------- Post added at 02:21 PM ---------- Previous post was at 02:19 PM ----------

Going to be a weedend driver for the wife and I.
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Old 11-21-2013, 12:30 PM   #5
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JDF. Don't know. Just got her 3 days ago. Havnt put 100 miles on it yet.

---------- Post added at 02:21 PM ---------- Previous post was at 02:19 PM ----------

Going to be a weedend driver for the wife and I.
Ok. I think most of the guys on here average right around the 17s city and 24s highway if they can keep their foot out of it.
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Old 11-21-2013, 12:36 PM   #6
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Ok. I think most of the guys on here average right around the 17s city and 24s highway if they can keep their foot out of it.
I average between 19 and 20 in the city. 22-24 highway.
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Old 11-21-2013, 12:38 PM   #7
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Ok. I think most of the guys on here average right around the 17s city and 24s highway if they can keep their foot out of it.
That's the rub, iddn't it lol

95% of my miles are city, manual 04 gt, and i get about 15 having a tiny bit of spirited driving
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Old 11-21-2013, 12:43 PM   #8
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That's the rub, iddn't it lol

95% of my miles are city, manual 04 gt, and i get about 15 having a tiny bit of spirited driving
All my miles are city and I'm getting 13cause of my stupid misfire. It's been probably a month since I've gotten on the highway for more than a minute
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Old 11-21-2013, 01:10 PM   #9
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20-23 mpg here
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Old 11-21-2013, 01:15 PM   #10
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I used to average about 19 mpg plus/minus depending on how I drove. I would get 23-24 on the highway. I haven't calculated it in awhile because frankly I don't care.
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Old 11-21-2013, 01:25 PM   #11
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22 MPG here. 98 gt 5 speed.
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Old 11-21-2013, 01:40 PM   #12
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I average 13mpg city in mine, and about 21mpg highway
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Old 11-21-2013, 01:44 PM   #13
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Old 11-21-2013, 01:46 PM   #14
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There's not a magic mod that will give you 2 mpg. Our 04 GT auto averages 17 in the city and I have stretched 24 out of it on the highway.

CAI and exhaust did nothing for mpg, not even a small improvement. The best thing you can do is keep up on maintenance.
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Old 11-21-2013, 01:50 PM   #15
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The best thing you can do is keep up on maintenance.
+1

Shortly after i first got mine, replaced plugs and air/oil/fuel filters. Four tanks before, got about 160miles before the idiot light came on. Afterwards and ever since, I hit 200 +/- 5
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Old 11-21-2013, 02:00 PM   #16
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Just bought my 1st mustang, 2004 convertible GT, automatic, and it didn't take but 55 years. Authough I love the power, my #1 wanted upgrade if fuel improvement. Gone are the days of going out on the weekend looking for a race. Anyone have any sugestions on the path I should take? Not sure if she has any upgrades, bought from a dealer.
Haha. That's what you say now but the first young punk that pulls alongside of you on the freeway, or, at a stoplight "gran prix"... You'll go.
These cars are good for 18mpg city and 25mpg highway if driven conservatively. Not bad for what they are but it will never be a Prius.
The 04's can definitely benefit from an aftermarket tune because they run slightly "rich".
Aside from being sure that the car is properly tuned up, an aftermarket tuner is the only mod that I would recommend for better mpg.
Have some fun with your car. They aren't "crazy" fast but still a good time for older guys like us...
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Old 11-21-2013, 02:10 PM   #17
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Haha. That's what you say now but the first young punk that pulls alongside of you on the freeway, or, at a stoplight "gran prix"... You'll go. These cars are good for 18mpg city and 25mpg highway if driven conservatively. Not bad for what they are but it will never be a Prius. The 04's can definitely benefit from an aftermarket tune because they run slightly "rich". Aside from being sure that the car is properly tuned up, an aftermarket tuner is the only mod that I would recommend for better mpg. Have some fun with your car. They aren't "crazy" fast but still a good time for older guys like us...
Says the guy who was near the top of our class in autocross lol
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Old 11-21-2013, 03:04 PM   #18
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Straybullett is probably wright, if the wife is not with me. Really looking forward to nice weather and cruising down the road with the top down, listening to the music of the sound system and the pipes. Only mods I will make for sure is a CAI and exhaust. Any suggestions on which Tuner I should get? Does any one know any facts about these smart chips advertised on the web? Thanks for all the input.
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Old 11-21-2013, 03:24 PM   #19
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Straybullett is probably wright, if the wife is not with me. Really looking forward to nice weather and cruising down the road with the top down, listening to the music of the sound system and the pipes. Only mods I will make for sure is a CAI and exhaust. Any suggestions on which Tuner I should get? Does any one know any facts about these smart chips advertised on the web? Thanks for all the input.
The chips are a waste of money and guaranteed to jack up your car. Almost everybody on here (me included) are running a Bama tune. If you go to AmericanMuscle.com they have different tuners on there that you can purchase. Each tuner does with a tunes For Life package which basically means if you want to update your tune then just send Bama an email and they will email you a new one free of charge
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Old 11-26-2013, 11:26 AM   #20
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I just filled up and I calculated that I got 24.6 mpg and my tire pressure was at 20 psi all around. I guess that I should check that more.
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Old 11-26-2013, 01:05 PM   #21
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This makes no sense...if your only gonna drive it on weekends why are you worried about mileage??? $20 will last you atleast 4 weekends of cruising...run 89octane and please stay out of left lane...lol
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Old 11-27-2013, 07:52 PM   #22
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When I started this thread, I meant what I wrote. Since then with all the info I've read on this sight I've changed my mind. Ordered 70mm TB, upper plenum. under drive pulleys and a Bama Tuner. Have I lost it or not? Or is this normal when someone gets one of these amazing cars?
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Old 11-27-2013, 08:00 PM   #23
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When I started this thread, I meant what I wrote. Since then with all the info I've read on this sight I've changed my mind. Ordered 70mm TB, upper plenum. under drive pulleys and a Bama Tuner. Have I lost it or not? Or is this normal when someone gets one of these amazing cars?
Yup, and it'll get 'worse'.

We should compare AM build lists lol
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Old 11-27-2013, 08:02 PM   #24
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Its pretty normal. You also are fortunate, the 2004 automatics were the only year to get the 4R75w transmission which amounts to a "built" transmission right from the factory. If you really want to get freaky put a set of 4.10 gears and a nice aftermarket stall converter in there with some suspension and fat tires.

Also, you have a vert, you NEED subframe connectors. Get the Steeda full length connectors and have a good shop weld them in for you. You'll be utterly amazed in the difference in ride quality.
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Old 11-27-2013, 08:08 PM   #25
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Its pretty normal. You also are fortunate, the 2004 automatics were the only year to get the 4R75w transmission which amounts to a "built" transmission right from the factory. If you really want to get freaky put a set of 4.10 gears and a nice aftermarket stall converter in there with some suspension and fat tires. Also, you have a vert, you NEED subframe connectors. Get the Steeda full length connectors and have a good shop weld them in for you. You'll be utterly amazed in the difference in ride quality.
2004 auto gt's FTMFW!!
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Old 11-27-2013, 08:16 PM   #26
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2004 auto gt's FTMFW!!
Yup, if I ever buy an edge that isn't a Terminator it will be a 2004 auto and a 2004 only. I'd love me a really clean 2004 Automatic Mach...
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Old 11-27-2013, 08:22 PM   #27
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Yup, if I ever buy an edge that isn't a Terminator it will be a 2004 auto and a 2004 only. I'd love me a really clean 2004 Automatic Mach...
yeah me too but I think autos only have a forged crankshaft right?
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Old 11-27-2013, 08:24 PM   #28
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Only things left in my BL are exhaust. High flow catted X mid and the flow master pipe combo.
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Old 11-27-2013, 08:32 PM   #29
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Only things left in my BL are exhaust. High flow catted X mid and the flow master pipe combo.
For now....
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Old 11-27-2013, 08:45 PM   #30
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When I started this thread, I meant what I wrote. Since then with all the info I've read on this sight I've changed my mind. Ordered 70mm TB, upper plenum. under drive pulleys and a Bama Tuner. Have I lost it or not? Or is this normal when someone gets one of these amazing cars?
Cold air induction will hurt mpg, but tuning usually helps- like already mentioned most cars are built to run richer than needed. I take it that mpg doesn't really matter much anymore...at all... lol

Enjoy your new ride
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Old 11-27-2013, 08:58 PM   #31
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Cold air induction will hurt mpg, but tuning usually helps- like already mentioned most cars are built to run richer than needed. I take it that mpg doesn't really matter much anymore...at all... lol

Enjoy your new ride
MPG still matters, that's why I'm not looking to change gears now. But I'm not going to say never. No never again.
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Old 11-27-2013, 09:00 PM   #32
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I average 21.5mpg city and have made over 27mpg with 90% hwy driving.

'02 GT 5-Speed.

Also, the Mustang gas tank is small. You can easily notice the needle moved every 15 miles.

Congratulations on getting a Mustang!
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Old 11-27-2013, 09:13 PM   #33
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MPG still matters, that's why I'm not looking to change gears now. But I'm not going to say never. No never again.
If you drive more city, look for lighter wheel/rim combinations, if more highway, then increasing your rear tire circumference. Aero mods helps, they make you go faster (top speed) and help you get there quicker (acceleration) while using less fuel in general. Dropping it helps, decreasing frontal area and usually less air underneath the car is better, especially if you don't build a full underbody.

I have a splitter, and had an air dam, but since I completed my full underbody, the air dam was just making it worse- so removed it.
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Old 11-27-2013, 09:19 PM   #34
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yeah me too but I think autos only have a forged crankshaft right?
The manual only does.
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Old 11-27-2013, 09:20 PM   #35
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The manual only does.
ah fa sho fa sho
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