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Old 01-07-2014, 11:46 AM   #1
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V6 Mustang gas mileage

Just curious as to what kind of gas mileage everyone else is getting out of these V6 cars? I have a 04 3.9L and although when I bought I wasn't expecting to get gas mileage like a 4 cyl, I feel like I'm getting worse MPGs then the GTs. If I'm on a long trip and can be consistent and set the cruise it does very well. Roadtrip to Florida for spring break last year I got pretty close to 29-30ish area. But casual highway I'm getting 19-20 at best. If I'm in the city, it's no problem dropping below 15. This just isn't right. So what are some of everyone's averages? And any ideas how to improve it?
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Old 01-07-2014, 11:48 AM   #2
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I'd love to hear this too. I have a 1996 3.8l v6 and get 14-15 in the city. In winter I've been getting lower.
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Old 01-07-2014, 11:57 AM   #3
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dont feel bad.. I purposefully bought a 13' v6 for better gas milage since i was coming from a truck..however i get 14-17 around the city with a little spirited driving thrown in, and 23-28 highway. I feel like i should be getting much better than that. If i would have known this i would have went ahead and bought a 5.0
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Old 01-07-2014, 12:33 PM   #4
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Best way is to stop having a heavy foot, make sure your spark plug and coil pack are good. Honestly, who buys a mustang for mpg? But I average maybe 15 city and 23 highway. I'm very spirited lol.
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Old 01-07-2014, 12:36 PM   #5
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Best way is to stop having a heavy foot, make sure your spark plug and coil pack are good. Honestly, who buys a mustang for mpg? But I average maybe 15 city and 23 highway. I'm very spirited lol.

Haha exactly, didn't buy this for the mpg and to not have fun.
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Old 01-07-2014, 12:37 PM   #6
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dont feel bad.. I purposefully bought a 13' v6 for better gas milage since i was coming from a truck..however i get 14-17 around the city with a little spirited driving thrown in, and 23-28 highway. I feel like i should be getting much better than that. If i would have known this i would have went ahead and bought a 5.0





Stick or auto? I have a '14 auto and cruising at 65-70 on the highway I'm seeing 31 and even 32 sometimes. In the city I will see about 17 or 18, but yeah, about 15 if I accelerate a little harder from stops and such.
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Old 01-07-2014, 02:17 PM   #7
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Stick or auto? I have a '14 auto and cruising at 65-70 on the highway I'm seeing 31 and even 32 sometimes. In the city I will see about 17 or 18, but yeah, about 15 if I accelerate a little harder from stops and such.
It's an auto. Im hoping when i get my tune on it, i'll get a bit better mpg
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Old 01-07-2014, 02:33 PM   #8
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My 2005 Mustang 4.0 V6 averages 23-25mpg on the highway, if I set the cruise control I get 27-28mpg. City it drops to 17-19mpg.
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Old 01-07-2014, 02:51 PM   #9
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It's an auto. Im hoping when i get my tune on it, i'll get a bit better mpg
Huh, interesting. Guess it's all in the way you drive it!
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Old 01-07-2014, 04:19 PM   #10
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30-32 on interstate then around 22-25 in city. Im shifting at around 2,000 rpms in city.
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Old 01-07-2014, 08:17 PM   #11
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I'm getting about the same. Every time I get on the gas I feel the dollar bills fly out the window. I should have my tuner here tomorrow so hopefully that helps out quite a bit.
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Old 01-07-2014, 09:06 PM   #12
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My 2010 4.0 gets 12-15 in the city where I do 90% of my driving
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Old 01-07-2014, 09:08 PM   #13
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Are you at least having fun? That's brutal...
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Old 01-07-2014, 09:15 PM   #14
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Oh it's a lot of fun but even when I drive like a grandma the best I've gotten in the city was 17
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Old 01-07-2014, 09:19 PM   #15
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Oh it's a lot of fun but even when I drive like a grandma the best I've gotten in the city was 17

That doesn't seem right at all. That's much worse than my 99 3.8.
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Old 01-07-2014, 09:41 PM   #16
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On the highway I can get around 25 but right when I get back in the city it drops fast. Maybe something's wrong but that's the way it's always been. I should try doing by hand instead of believing the trip computer.
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Old 01-07-2014, 09:49 PM   #17
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I get awful mpg's also, but I did buy a mustang and not a honda... I agree though I feel like I am getting v8 gas mileage if not worse!
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Old 01-07-2014, 10:13 PM   #18
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my 06 4.0 gets about 17-19 city and 21-23 highway. i have actually seen 25.9 once. but ive never been able to do it again.
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Old 01-08-2014, 08:39 AM   #19
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Is it bad that I get 12-14 on my 04 v6...with race tune?

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---------- Post added at 08:39 AM ---------- Previous post was at 08:39 AM ----------

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Old 01-08-2014, 01:50 PM   #20
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I averaged 28 on a long trip with some hills. Had a few spots where we going 80+.
With 2.73 gears it easily cruised at 80mph though.
I don't know what I get now though. I've done quite a few mods.
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Old 01-09-2014, 04:16 PM   #21
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Guys, you are not allowed to talk about gas mileage in this forum, this is a Mustang forum not a Honda lol

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Old 01-09-2014, 06:20 PM   #22
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Guys, you are not allowed to talk about gas mileage in this forum, this is a Mustang forum not a Honda lol
This is funny because I've thought about this after seeing a Prius or two lol
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Old 01-09-2014, 09:56 PM   #23
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This is funny because I've thought about this after seeing a Prius or two lol

Do you know that GM sold the Prius engine technology to Toyota maybe more than 20 years ago, because GM knew it wasn't the right time for electric cars yet, and until today Toyota couldn't pay off the money they paid to that technology from selling stupid Prius lol
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Old 01-10-2014, 12:47 AM   #24
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I've always felt in theory the V6 engines should yield better MPG than the V8 stangs, but from my experience the results are ab the same, if not, the V8 comes out on top just because it seems to pull a 3600+ pound Mustang better than the V6's.

Although the new 3.7 seems to be the best on the highway for sure.
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Old 01-10-2014, 02:16 PM   #25
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I think mine has some sort of problem because my car runs out of gas after I have driven 175 miles basically 35 min drive to work there and back mon-fri driving normal by Thursday night or Friday morning I'm filling up again
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Old 01-20-2014, 09:26 PM   #26
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I have no idea what I get on the highway because I haven't taken mine on long trips, but I usually fill up around once a week when it hits around 1/4 of a tank. I usually get about 210-220 before I hit the 1/4 mark depending on how I drive. But I would say mine gets around 17-18/mpg? I am about to get some aftermarket parts from American Muscle that'll help with it, though.
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Old 01-21-2014, 06:20 AM   #27
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I have no idea what I get on the highway because I haven't taken mine on long trips, but I usually fill up around once a week when it hits around 1/4 of a tank. I usually get about 210-220 before I hit the 1/4 mark depending on how I drive. But I would say mine gets around 17-18/mpg? I am about to get some aftermarket parts from American Muscle that'll help with it, though.

I guess these cars don't get good gas mileage... Wat parts would you be buying from AM to help
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Old 01-21-2014, 03:15 PM   #28
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I normally get anywhere from 15-20 in city in my 99 v6. But it could be worse because I have a faulty egr valve.
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Old 01-21-2014, 03:56 PM   #29
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I guess these cars don't get good gas mileage... Wat parts would you be buying from AM to help

Make sure you are replacing your fuel filters regularly. I do mine twice a year. They say CAI helps gas mileage and I believe exhaust as well because it helps it breathe better. Of course exhaust upgrade would take too long to pay for itself with gas savings so that should be something you get for the sound and looks and appreciate anything else that comes with it.
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Old 01-21-2014, 07:38 PM   #30
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I guess these cars don't get good gas mileage... Wat parts would you be buying from AM to help

Well no, they're not made to get 30 mpg.. Lol. But I plan on getting a new cold air intake, a new coil pack, and eventually a new exhaust. I also heard you can use a tuner and tune it to get better gas mileage, but I dunno if it's true or not and I heard it cuts your power. Does anyone know if you can do it, though?
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Old 01-21-2014, 07:52 PM   #31
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You don't need a coil pack unless yours goes out or is having problems, but a tuner is good at letting your car reach it's full potential with the aftermarket parts you have on it. So, the more parts you have the more the tuner is worth buying. With just a CAI it wouldn't be worth a tuner unless you plan on putting more parts on it in the future. With that being said if you do buy a CAI and tuner combo off American muscle it's a better deal and it comes with free lifetime tunes so you'd be set for any future upgrades you put on!
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Old 01-21-2014, 08:55 PM   #32
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You don't need a coil pack unless yours goes out or is having problems, but a tuner is good at letting your car reach it's full potential with the aftermarket parts you have on it. So, the more parts you have the more the tuner is worth buying. With just a CAI it wouldn't be worth a tuner unless you plan on putting more parts on it in the future. With that being said if you do buy a CAI and tuner combo off American muscle it's a better deal and it comes with free lifetime tunes so you'd be set for any future upgrades you put on!

Ahh okay. Question.. So say my friend has a tuner, would I be able to use his on my Mustang? Or would I have to go buy my own? I'm not 100% on how to work them. Lol.
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Old 01-21-2014, 09:02 PM   #33
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I am not sure if this applies to all tuners but most tuners cannot be shared between vehicles unless you place the original vehicle back to stock before changing it to a different car. If you see one for sale and it says unmarried/unlocked the original car has been placed back to stock and it is safe to buy it. If it says married/locked than you can't use it until you pay the company to reset it and I wouldn't buy it.
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Old 01-21-2014, 09:11 PM   #34
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Yeah you'd have to get your own they marry to the vehicle.
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Old 01-21-2014, 09:30 PM   #35
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Wait, how are you guys doing so bad with mpg, i always average 24 with mix hwy/city, i've never done all highway, and i don't drive like grandma either, if anything i push the car too hard! Lol.
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