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2011 GT mpg question

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Old 12-25-2011, 02:05 PM   #1
Bill_Texas
 
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Default 2011 GT mpg question

Greetings and Happy Holidays to all.

I have owned my 2011 Mustang GT for about 6 months. It is my daily driver and I drive it approx. 56 miles per day mostly highway miles. What I am finding is that the advertised 26 mpg highway appears to be false. The computer is showing that I am averaging 20 mpg. Simple math is showing similar results.

I have heard other similar complaints on other formums. I am beggining to think that this is false advertising by Ford. My goal is to find out if I am right by asking anyone out there to post their estimated mpg results as well.

Thanks in advance to anyone that responds!
Bill
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Old 12-25-2011, 03:10 PM   #2
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I've noticed the same with my 5.0 (6MT w/3.73), typically 20-21mpg average on the computer.. but I was attributing that to my lead foot. It will go up 2-3mpg if I do EXACTLY the speed limit.
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Old 12-25-2011, 04:07 PM   #3
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If you have 3.73:1 rear gears, yeah, the fuel mileage will not be the advertised 26mpg hwy.
Also, you car will improve in mpg once you reach 5000 miles.

I have 3.31:1 rear gears on mine and on straight highway at 70mph, I get 28mpg. I have seen on rare occasions 30-31mpg average.

What destroys fuel mileage are stop signs, stop lights, and speed limits less than 60mph. City driving. In city driving I see high teens mpg avg.
Mixed hwy and city I see 21-23 mpg avg over a month time.
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Old 12-25-2011, 04:18 PM   #4
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held an average of 22 for a few weeks (mixed, 60/40 city/hwy) (man. 3.31). If you want to see the 26 mpg reset the avg mpg meter on the entrance ramp. These cars, when driven appropriately as Jim5.0 indicated, will get the advertised mpg. I'd like to know how he got the 30mpg. I got 27 on the way up to charlotte 3 weeks ago by resetting the meter. Does anyone know if the computer uses a rolling average, and if so what is the interval that it uses?
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Old 12-25-2011, 04:28 PM   #5
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I just drive at a steady 70mpg for a 100 mile trip. I often use cruise control to lock it in and kick back and relax. I wish cars had autopilot and drove themselves so I can take a nap.
Now, the highways in Texas are mostly very flat with few rolling hills. That greatly helps fuel mileage vs going up and down hills.
The rare times I saw 30mph avg is when there is a strong wind on my ***. Driving into the wind? At 70mph on same highways, maybe 24mpg avg
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Old 12-25-2011, 07:49 PM   #6
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With a 3.55 rear, I have had 23.5 in mixed 50/50 driving over a few tanks combined. I was going very, very easy on it. That should give me over 26 on highway. But it took tremendous, unsustainable self control to do that!
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Old 12-25-2011, 07:49 PM   #7
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Click the image to open in full size.

Specs below. Got this going 70mph on my trip to VA.
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Old 12-25-2011, 08:54 PM   #8
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Your specs bring up another point. Is the GT/CS/Boss front valence actually more aerodynamic? I think with the LS splitter it would be less due to the increased down force but the cs and the stock valences have almost the same configuration.
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Old 12-26-2011, 08:46 AM   #9
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Thanks to everyone for the responses.
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Old 12-26-2011, 10:25 AM   #10
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2011 GT m6 with 3.31 rear gears.
Ceramic coated Stainless Works Long tube headers, hi flow cats, x-pipe and chambered mufflers.
Steeda CAI and aggressive tune to make it all run nice.

At 60 i get 26 to 29 mpg.

In October took it on a 550 mile road trip down I-95, doing an honest 70 mph I averaged 26.7 miles to the gallon.

The Ford numbers are for the 3.31 manual or the 3.15 automatic, I don't remember which one.

During the warmer weather I average 23 and in the cold 20.
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Old 12-26-2011, 12:54 PM   #11
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Quote:
Originally Posted by Falcon Fixer View Post
2011 GT m6 with 3.31 rear gears.
Ceramic coated Stainless Works Long tube headers, hi flow cats, x-pipe and chambered mufflers.
Steeda CAI and aggressive tune to make it all run nice.

At 60 i get 26 to 29 mpg.

In October took it on a 550 mile road trip down I-95, doing an honest 70 mph I averaged 26.7 miles to the gallon.

The Ford numbers are for the 3.31 manual or the 3.15 automatic, I don't remember which one.

During the warmer weather I average 23 and in the cold 20.
Ford's mpg numbers are also from a scenario that is likely.. 1st-4th-6th for most driving and keeping it at or below 2,500 rpm with each shift... and staying at 70mph or below... on a flat road.

For a 412 HP car with nearly as much torque..and as big as it is.. 19-20 mpg should be your "real life" mpg goal. If you need an extra few miles out of the gas tank.. get to 6th as fast as you can and cruise at 60-65.
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Old 12-26-2011, 03:02 PM   #12
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I'm less than 1000 miles and get average 17.6 mpg. and this is highest i have really seen with the exception of setting on the highway but it slowly declines of coures and all i drive is highway 99% of the time.
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Old 12-27-2011, 09:53 AM   #13
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I get about 18mpg all around. But, I have a lead foot. If I take it easy on the highway and maintain 75mph, I get about 22mpg. I have 3.73 gears. Those that get 24mpg or better with 3.73's on the highway must be going downhill 100% of the time.
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Old 12-27-2011, 11:58 AM   #14
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with the automatic and 3.15s i was seeing 26-28mpg on the highway, and about 20 in town. once i went to 4.10s I now get 21mpg high and 15 in town. under normal driving... if i get into the throttle heavily, then im at 10mpg.

although, i think i only had the factory tune on my car for about 500 miles. so it's possible i was getting better mileage off the tune. although I think that is unlikely.
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Old 12-27-2011, 12:03 PM   #15
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Quote:
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with the automatic and 3.15s i was seeing 26-28mpg on the highway, and about 20 in town. once i went to 4.10s I now get 21mpg high and 15 in town. under normal driving... if i get into the throttle heavily, then im at 10mpg.

although, i think i only had the factory tune on my car for about 500 miles. so it's possible i was getting better mileage off the tune. although I think that is unlikely.
You got the tune at the same time you went with 4.10s or no? That's a big drop in mpg.
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Old 12-28-2011, 12:50 PM   #16
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i got the tune about 4 months before the gears. the drop in MPG is from the gears. although i did put on the boss intake manifold and a different tune on it, i don't think that is the problem. I noticed a similar change in mpg when i did 4.10s in my 2007, although i gained in town mpg with those.
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Old 12-28-2011, 05:32 PM   #17
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Just burned up my first tank of gas in the new stang - averaged 12mpg. having a little too much fun? : P

most of the driving was freeway, too, just varying speeds as best as I can while it 'breaks in'
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Old 12-30-2011, 03:55 PM   #18
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I have 3.73 and my computer shows average about 19.5 MPG for me, however on the highway I know I average about 26 - 27 MPG as I fugured it myself at the pump. But we're flatlanders around here so the highway is long level and straight.

I'm thinking that average computer MPG is based on the previous 500 miles....I could be wrong.
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Old 12-30-2011, 05:34 PM   #19
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the computer mpg is based on current fuel usage and distance travelled, you can reset it while you are driving, for example, soon after buying the car i sped up to 80, reset it and let off the gas, for awhile it said i was getting 99.9 miles per gallon
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Old 12-31-2011, 01:50 AM   #20
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You, sir, are cheating
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Old 12-31-2011, 01:50 AM
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