MPG and Break-in Period - Mustang Evolution

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Old 09-20-2013, 10:40 AM   #1
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MPG and Break-in Period

My GT has about 1,200 miles and no matter how much I baby the throttle, I'm getting mixed hwy/city (60/40) of 17MPG; it may go down to the 16 range sooner or later.

1. How many miles should I have in my car before I can hopefully notice an improvement in MPG?

1. OR should this be all I'm getting?

** I have a 14' GT auto - O/R xpipe, CAI, Bama 93 Street tune, and GT500 axles.**
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Old 09-20-2013, 11:05 AM   #2
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Is your rear o2's off? I noticed a 5mpg gain from switching from the performance to street tune and turning the rears o2's back on. Also auto or manual? Whiles trying to save gas on a manual you can shift to a higher gear sooner but too soon can make you big which makes you use even more gas, and I believe its been said there isnt a break in period and come broken in but not 100% on that
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Old 09-20-2013, 11:10 AM   #3
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Originally Posted by seville View Post
My GT has about 1,200 miles and no matter how much I baby the throttle, I'm getting mixed hwy/city (60/40) of 17MPG; it may go down to the 16 range sooner or later.

1. How many miles should I have in my car before I can hopefully notice an improvement in MPG?

1. OR should this be all I'm getting?

** I have a 14' GT auto - O/R xpipe, CAI, Bama 93 Street tune, and GT500 axles.**
This may not be relevant but, a friend has the Bama tune and his pipes stay black all the time. I expect the tune is killing his mileage. I have a factory tuned '14 GT/TP with Airaid CAI, Heartthrob Flowpack axlebacks and 2,300 miles on the clock. My little piss-stop of a town is riddled with stop lights and signs, so my city driving is at 35mph and below. I get nearly 14mpg in town and have gotten as high as 24mpg on the interstate. But, I rarely try to drive economically or hold my speed down. I hold no faith in the belief that mileage will increase as time goes on. Didn't happen on my '07 GT and I don't believe my '14 will be any different.
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Old 09-20-2013, 11:13 AM   #4
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Welp gotta choose power or mpg cant be great in both yet!
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Old 09-20-2013, 11:33 AM   #5
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Originally Posted by MidnightBlueGT View Post
Is your rear o2's off? I noticed a 5mpg gain from switching from the performance to street tune and turning the rears o2's back on. Also auto or manual? Whiles trying to save gas on a manual you can shift to a higher gear sooner but too soon can make you big which makes you use even more gas, and I believe its been said there isnt a break in period and come broken in but not 100% on that
It's probably the tune because all the rear O2s do is check the air coming through the pipes after the cats and throw a code if something is wrong. It's the front O2s that actually do something for the A/F
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Old 09-20-2013, 12:21 PM   #6
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Originally Posted by MidnightBlueGT View Post
Is your rear o2's off? I noticed a 5mpg gain from switching from the performance to street tune and turning the rears o2's back on. Also auto or manual? Whiles trying to save gas on a manual you can shift to a higher gear sooner but too soon can make you big which makes you use even more gas, and I believe its been said there isnt a break in period and come broken in but not 100% on that
The rear o2 sensors are off (no signals on the dashboard) and my car is an auto. How would turn the o2s back on?
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Old 09-20-2013, 02:09 PM   #7
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Another tune
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Old 09-20-2013, 07:04 PM   #8
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Yea I have the Bama 93 Race Cam tune and my highway/city mpg has dropped from about 27/17 on stock tune to 23/14. I know the cam tune kills mpg at idle but I have reset my mpg on it cruising down the highway and it only gets up to about 23mpg. I'm installing the 93 hybrid tune tomorrow so I'll let you guys know what kind of difference that makes with my mpg's.
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Old 09-20-2013, 09:43 PM   #9
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I do only city driving and I get 18.4 with a 93 BAMA hybrid tune... '13 GT/CS with an auto tranny
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