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Discussion Starter · #1 ·
Hi, i recently bougt a GT 2010 Mustang and im kinda disappointed about the city milage. I believed it was advertise as 18 but ive been getting 14. Any suggestion? i didnt put any mods on it except Flow master muffler. Thank you and have a great day
 

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Hi, i recently bougt a GT 2010 Mustang and im kinda disappointed about the city milage. I believed it was advertise as 18 but ive been getting 14. Any suggestion? i didnt put any mods on it except Flow master muffler. Thank you and have a great day
City only (without any highway) will kill your mpg... Especially if you drive like a mustang should be driven. You might be able to get a tune that is tailored to increase mileage, but performance will suffer.

If it makes you feel better, I average 12.
 

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I've been averaging about 18 mpg. All of mine are hwy, doing about 80 mph. Can some one Tell me if that is normal for the winter weather.

---------- Post added at 02:29 PM ---------- Previous post was at 02:28 PM ----------

I have a 2011 Gt/CS
 

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I've been averaging about 18 mpg. All of mine are hwy, doing about 80 mph. Can some one Tell me if that is normal for the winter weather.

---------- Post added at 02:29 PM ---------- Previous post was at 02:28 PM ----------

I have a 2011 Gt/CS
that is what I have been getting. When it was warmer out was right about at 20.

---------- Post added at 03:45 PM ---------- Previous post was at 03:44 PM ----------

Hi, i recently bougt a GT 2010 Mustang and im kinda disappointed about the city milage. I believed it was advertise as 18 but ive been getting 14. Any suggestion? i didnt put any mods on it except Flow master muffler. Thank you and have a great day
what gearing do you have? I actually got worse street MPG when I had 3.31 gears than the 3.73 gears I have now.
 

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I get 20 mpg in warm weather and18 mpg now in Wisconsin. Driving a 2010 gt that has flowmaster mufflers and not tuned. It is what it is after all, a powerful Mustang. Enjoy the drive
 

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I've been averaging about 18 mpg. All of mine are hwy, doing about 80 mph. Can some one Tell me if that is normal for the winter weather.

---------- Post added at 02:29 PM ---------- Previous post was at 02:28 PM ----------

I have a 2011 Gt/CS
After 65+ your mileage starts going downhill.
 

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After 65+ your mileage starts going downhill.
don't agree, I get better gas mileage at 80 than I do 65. At least with my drive from Cinncinnati,OH to Florence Ky I make to work 4 days a week.

I have tested this. Did a day where I reset MPG and drove 65, then did a day where I reset and drove 80.

80 yielded me 19.6 and 65 yielded me 18.9. THis was with it 55 degrees or so out each day.
 

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Discussion Starter · #10 ·
that is what I have been getting. When it was warmer out was right about at 20.

---------- Post added at 03:45 PM ---------- Previous post was at 03:44 PM ----------



what gearing do you have? I actually got worse street MPG when I had 3.31 gears than the 3.73 gears I have now.
I have a stock gears. ( 3.31?) So if i upgraded to 3.73 would it improve?

---------- Post added at 12:55 PM ---------- Previous post was at 12:53 PM ----------

Would upgrading my stock intake improve MPG? any suggestions?
 

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I have a stock gears. ( 3.31?) So if i upgraded to 3.73 would it improve?

---------- Post added at 12:55 PM ---------- Previous post was at 12:53 PM ----------

Would upgrading my stock intake improve MPG? any suggestions?
Honestly on the 4.6L V8 I am not sure. I know for the newer cars a steeper gear can help with city driving but can also not help as the car feels faster off the line and you will want to floor it more often!

With the 3.73 gears I can drive 40 on city roads and sit in 6th gear, with the 3.31 gears I had to sit in 5th at a higher rpm. YOu don't have a 6th gear, so I am not sure if it would help or hurt you, since you'd get stuck in 5th?

Intake might get you +1 or 2 MPG and that would be it. even then Maybe. Yet again unsure on the 4.6L as most of us have the 5.0
 

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londi1tagaholy said:
Hi, i recently bougt a GT 2010 Mustang and im kinda disappointed about the city milage. I believed it was advertise as 18 but ive been getting 14. Any suggestion? i didnt put any mods on it except Flow master muffler. Thank you and have a great day
It's the axle backs causing the bad mpgs. Admit it, you love the sound. I've never got more than 14mpg on my 4.6
 

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londi1tagaholy said:
I have a stock gears. ( 3.31?) So if i upgraded to 3.73 would it improve?

---------- Post added at 12:55 PM ---------- Previous post was at 12:53 PM ----------

Would upgrading my stock intake improve MPG? any suggestions?
By increasing gears, you are increasing the engine speed for a given travel speed.

This is just an example, but simply:
3.31 gears at 65 mph in top gear is 2200 rpms.
3.73 gears at 65 mph in top gear is 2400 rpms.

So engine speed increase for the same driving speed. I can not really think of a time gears will become MORE fuel efficient.

On the forum I have learned about maximizing vehicle efficiency, the cone intakes do not consistently make a noticeable difference, in fact my testing has shown it is worse with the cone. I still use it, like it, and suggest it, though lol

nosympathy said:
Honestly on the 4.6L V8 I am not sure. I know for the newer cars a steeper gear can help with city driving but can also not help as the car feels faster off the line and you will want to floor it more often!

With the 3.73 gears I can drive 40 on city roads and sit in 6th gear, with the 3.31 gears I had to sit in 5th at a higher rpm. YOu don't have a 6th gear, so I am not sure if it would help or hurt you, since you'd get stuck in 5th?

Intake might get you +1 or 2 MPG and that would be it. even then Maybe. Yet again unsure on the 4.6L as most of us have the 5.0
Maybe with an auto there is trouble, but I am a v6 standard, and I can drive in 6th as low as 28 ish mph. When I drive at 39 mph in 6th, I get 50+ mpg with real low rpms. 2.7x gearing.
 

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By increasing gears, you are increasing the engine speed for a given travel speed.

This is just an example, but simply:
3.31 gears at 65 mph in top gear is 2200 rpms.
3.73 gears at 65 mph in top gear is 2400 rpms.

So engine speed increase for the same driving speed. I can not really think of a time gears will become MORE fuel efficient.

On the forum I have learned about maximizing vehicle efficiency, the cone intakes do not consistently make a noticeable difference, in fact my testing has shown it is worse with the cone. I still use it, like it, and suggest it, though lol

Maybe with an auto there is trouble, but I am a v6 standard, and I can drive in 6th as low as 28 ish mph. When I drive at 39 mph in 6th, I get 50+ mpg with real low rpms. 2.7x gearing.
Yeah a V6 with 2.7x gearing com paired to a 5.0 with 3.73 gearing.

My car "can" drive 6th down to 35 any lower and my car is idling RPMs and will stall.
 

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nosympathy said:
Yeah a V6 with 2.7x gearing com paired to a 5.0 with 3.73 gearing.

My car "can" drive 6th down to 35 any lower and my car is idling RPMs and will stall.
Ah, I was thinking you could take it lower. Gearing confuses me a bit, I have to take it slow.
I was thinking with the power you guys have, you would be good.
 

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Ah, I was thinking you could take it lower. Gearing confuses me a bit, I have to take it slow.
I was thinking with the power you guys have, you would be good.
Yeah it has a tone of power but with where my gearing puts 6th on the 5.0 it ends up around idle Rpms which it can do going downhill but get a slight hill and stall city.
 

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The taller the rear gear numbers, the lower the rear wheel rpm at the same engine rpm. Off roaders want tall gears. In other words, higher numbers for higher hills.

It is a balance of engine peak efficiency to desired highway speed. The normal rule is to lower engine rpm to the lowest engine efficiency curve for maximum gpm.

A gasoline engine performs better with higher intake manifold temperature. The increased temperature creates higher molecular activity in the fuel, which allows for more complete combustion, aka better gpm.

The payback in changing the pumpkin ratio is going to be a long, thin line. Better to change the fluids to synthetics, and realize immediate returns on the investment, plus longer life of the vehicle.
 
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