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Old 04-24-2014, 04:35 PM   #1
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What's your gas mileage like?

Since I've owned my 2004 GT, I've never gotten more than 19 mpg (regular) and since getting a custom tune it hasn't gone above 17 mpg (premium). I've seen people with this generation of GT boasting mileage upwards of 25 mpg, and I'm wondering if these guys are outliers, or if 20-25 mpg is normal for mixed city/highway driving?
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Old 04-24-2014, 04:38 PM   #2
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I personally think that's internet hype. I get horrible gas mileage. Maybe like 55 miles with 20 bucks of 91 in the tank
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Old 04-24-2014, 04:53 PM   #3
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I have legitimately gotten 26 mpg on a trip where I was on the freeway for the entire tank of gas. That's a round trip average that was hand calculated. So yes, these cars will get the mileage that was promised on the window sticker.
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Old 04-24-2014, 05:37 PM   #4
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What's your gas mileage like?

Not modded lol

Or a 4 speed auto
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Old 04-24-2014, 05:46 PM   #5
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With a spot on tune and pure highway driving at around 1700-1900rpm is where these cars will get best mpg, it's possible. I averaged 18 on the highway because I would go around 75-80 pretty aggressively with the other stupid drivers in the fast lane going slow. Now I don't expect to get anywhere near that cause I still go near the same speed but have 4.10s. And city driving, lol lets not talk about the mpg I get in the city.
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Old 04-24-2014, 05:53 PM   #6
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I have gotten 29 mpg on freeway between clearwater fl and gaylord mi... 2004 gt 5 speed muffler delete lowered 2" running 275 35 18 front and 285 35 18 back with moble one synthetic engine oil... Repeated on trip back to fl car had 69,000 miles on it and was done June 2013... Since then with 93 tune in the city I get around 15 to 17 but I'm sure I could get 19 city but hey it's a mustang right I will say with the tune it seems like mpg dropped but gas prices are going up so idk I haven't actually done the math like I did on my michigan trip
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Old 04-24-2014, 06:01 PM   #7
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Lol, this was a while back. But you can see I didn't care too much for mpg at the time.
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Old 04-24-2014, 06:28 PM   #8
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With a spot on tune and pure highway driving at around 1700-1900rpm is where these cars will get best mpg, it's possible. I averaged 18 on the highway because I would go around 75-80 pretty aggressively with the other stupid drivers in the fast lane going slow. Now I don't expect to get anywhere near that cause I still go near the same speed but have 4.10s. And city driving, lol lets not talk about the mpg I get in the city.

I have 100% city driving so.......


Lol
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Old 04-24-2014, 08:29 PM   #9
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I have gotten 29 mpg on freeway between clearwater fl and gaylord mi... 2004 gt 5 speed muffler delete lowered 2" running 275 35 18 front and 285 35 18 back with moble one synthetic engine oil... Repeated on trip back to fl car had 69,000 miles on it and was done June 2013... Since then with 93 tune in the city I get around 15 to 17 but I'm sure I could get 19 city but hey it's a mustang right I will say with the tune it seems like mpg dropped but gas prices are going up so idk I haven't actually done the math like I did on my michigan trip
Side note, what part of Clearwater are you in? I used to live in Largo, and now I'm over in Brandon. We got a club that does monthly meets if you're interested. This sunday were planning on cruising to Indian Rocks beach!
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Old 04-24-2014, 08:47 PM   #10
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18 city, 22 hwy. 04 auto. Intake/exhaust

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Old 04-24-2014, 08:52 PM   #11
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Keep the 3.27 gears and the cel off and low to mid 20's is very possible.
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Old 04-24-2014, 09:19 PM   #12
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Average mpg in 97 gt auto with CAI that's it.

But got up to 24 mpg in my old 98 gt 5 speed with exhaust and that was it.
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Old 04-24-2014, 09:23 PM   #13
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I average about 17 in my mach with 4.10s with mixed driving and a street tune
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Old 04-24-2014, 09:25 PM   #14
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Sad part is my first mustang was a v6 2001 auto and only saw 20 mpg. Bone stock.
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Old 04-24-2014, 10:18 PM   #15
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Quote:
Originally Posted by XSlashDashX View Post
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Average mpg in 97 gt auto with CAI that's it.

But got up to 24 mpg in my old 98 gt 5 speed with exhaust and that was it.
How is that an accurate measure when your fillups are all the same price?

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Old 04-24-2014, 10:34 PM   #16
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250 to the tank, think it would be better without the 75mm TB

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Old 04-24-2014, 10:45 PM   #17
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Old 04-24-2014, 10:48 PM   #18
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Lol I can drive 10 mins into town and back and burn a 1/4 tank. But my car has full bolt ons, 3.73 gears and is running pretty darn rich, which had been giving me problems, but yeah I get pretty bad mileage
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Old 04-24-2014, 11:19 PM   #19
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I've been getting horrible gas mileage lately. My trip is reading 120-150 miles to a tank. Ever since my 3.73 installation it has been bad.

However, I do not think my odometer is reading 100% accurately. My speedometer isnt 100% perfect either. If I have my GPS going on the highway and there is something 1 mile ahead, once I pass that my odometer will only be .8 miles higher, if that makes any sense
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Old 04-25-2014, 01:46 AM   #20
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Haha
I think that I burn up about 2 gallons of gas to do 4 laps of autocross... It takes less than four minutes to do those four laps...

I don't think that I've ever gotten less than 18 mpg though.

Dann, that's a 20% difference that your odometer is off from the GPS. So that means you're getting 20% BETTER gas mileage!
Be careful though, that also means that your speedometer is only showing 80% of your true speed.
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Old 04-25-2014, 09:22 AM   #21
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I was getting 23 highway on my first road trip

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Old 04-26-2014, 05:52 PM   #22
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70/30 mix of city/hwy driving:
13.878 gallons for 227.4 miles

85/15 mix of hwy/city:
13.761 ---> 290.9
13.161 ---> 278.3

One of these days I'll crest that 300 plateau
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Old 04-26-2014, 07:51 PM   #23
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Getting about 13.5-14 mpg city. I haven't taken a highway trip in a long time so I can't say how good that is.
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Old 04-29-2014, 02:41 PM   #24
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11, 93r tune city driving. 20 hwy
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Old 04-29-2014, 02:44 PM   #25
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I want to go on a long trip to see what type of mpg I get at 80 with these 4.10s. Turning 3k on the highway lol
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Old 04-29-2014, 06:15 PM   #26
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I once got 25mpg 93r tune all highway going 70mph 90% of the time and 60 the rest. Stock gears though. Now that it's not my daily i don't care about fuel mileage diesel is cheaper than 93 here anyway
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Old 04-29-2014, 06:33 PM   #27
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I'm getting about 15 all together

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