Drop in mpg after mods?! - Mustang Evolution

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Old 06-04-2015, 08:59 PM   #1
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Drop in mpg after mods?!

Hey all,

Was wondering if anyone else has seen this and why? I put on a CAI, X-pipes, Steeda axle backs and tuned it with SCT X4 tuner. Before the mods I was around 17-18 mpg. After the mods I shot up to about 25mpg on the highway. After a couple of weeks, not a ton of driving, it dropped big time. Down into the 16's. Why such the big drop?

Thanks in advance.
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Old 06-05-2015, 03:47 AM   #2
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Never heard of that. Is ur filter dirty because u live in a dusty climate?


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Old 06-05-2015, 03:47 AM   #3
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Only dropped 2 mpg? Usually it is due to the heavier foot. You may not even realize it but your car is now more fun the drive spirited with and may be doing it without noticing lol.
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Old 06-05-2015, 04:37 AM   #4
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and what were you getting on the hwy B4? I am dubious of any mpg # that is not done with math so if you are depending on the cars number recheck your numbers.

+1 on the right foot may be part of your problems with the new sound both making you giggle each time you step on it but also drop mpg
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Old 06-05-2015, 04:43 AM   #5
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Or, the new mods are catching up with the averaged MPH calculation. Most vehicles with built in calculators, or guages that plug into the OBD II plug have two seperate readings for MPH calculation: one is the average (calculated over several days of driving), and the other is instant; the instant is what you are getting at that moment, and calculated would be an average over several days. Calculated would also include your city and highway driving combined.
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Old 06-05-2015, 08:46 AM   #6
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I used to average 20 with a stock factory tune on 87 octane. I now average 18 on 87 with CIA and tune but the drivability is way better and wouldn't go back. My highway mpg's seems to be the same a before but city/stop and go traffic has decreased. But I can go light to light a lot faster!
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Old 06-05-2015, 08:52 AM   #7
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I will admit ever since all my mods, even if I baby it I still cannot get 20 avg mpgs city/highway combined. I accept my car is built more for power now then how it was stock from Ford. Which is tuned for grandmas
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Old 06-05-2015, 10:06 AM   #8
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Just because I can. Don't hate this is with my coyote.

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Old 06-05-2015, 10:08 AM   #9
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Just because I can. Don't hate this is with my coyote.

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ewwww!!! Base cluster!!! Just kidding. You must have a light foot if you have that in a 5.0. LOL
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Old 06-05-2015, 10:12 AM   #10
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I admit my right foot is part of the issue, no doubt. Haha. However, I was at around 18 highway before the mods, 25 highway after the mods. I'm back down to the 18 highway. So it dropped about 7mpg about a month after the mods. Just wondering if that is normal or not. I'm actually taking her out on a good ride this weekend, mostly highway. Will be a better test than the shorter trips o have made recently on the highway.

And I do have a goofy smile every time I hit the gas!! I love it!!
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Old 06-05-2015, 10:12 AM   #11
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I drive 99% freeway. About 800 miles a week. I actually get in it quite a bit, but my regular set at 77 mph cc helps average it out.


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Old 06-05-2015, 03:37 PM   #12
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It was explained to me by an mechanic. The easier you make it for your motor to bring in air and expell exhaust, the more power your motor will have because it can burn more gas. Sounds right to my simple brain.
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Old 06-05-2015, 03:39 PM   #13
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Quote:
Originally Posted by woogstang View Post
I admit my right foot is part of the issue, no doubt. Haha. However, I was at around 18 highway before the mods, 25 highway after the mods. I'm back down to the 18 highway. So it dropped about 7mpg about a month after the mods. Just wondering if that is normal or not. I'm actually taking her out on a good ride this weekend, mostly highway. Will be a better test than the shorter trips o have made recently on the highway.

And I do have a goofy smile every time I hit the gas!! I love it!!
The 25 highway doesn't sound accurate. I think it settling down at 18 is more realistic
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Old 06-05-2015, 07:22 PM   #14
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I am with OXFORD I get 22-23 in all around driving 373s. Seems like sixs are getting less most of the time. I would think they should be getting more.
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Old 06-06-2015, 09:49 AM   #15
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I drive close to 300 miles, all highway, yesterday. Got 21.8 mpg. So I guess it's my heavy foot trolling around the city. Lol
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Old 06-15-2015, 07:42 AM   #16
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Over the last 5 years I have noticed mpg varies quite a bit depending on how you drive my car. Stock auto gt vert got around 25-26 hwy. after fi and gears, heads cams, etc. 21-22 hwy. if I don't pass too much! Heavy foot easily brings hwy down to 17-18 mpg. City, and I live in a hilly one 15-16 prior to mods, now 11-12. 3k torque converter also. 4.10s and hot rod cams, 14 psi v3, snow boost cooler. Maybe we should trade in for an eco boost if we are giving a **** about mileage! More power equals more air and more fuel. Methanol substitutes for gasoline when spraying but ya have to pay for that too. "Ya canna breaks the laws of physics!" - Scotty to Captain Kirk.


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Old 06-15-2015, 07:54 AM   #17
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Drove to Washington DC this past weekend. 27.1 MPG with a REALLY light foot and cruise control set to 5 over for the ride down. I have 1700 miles on my car right now, oh and that was with top down for 1/2 of the trip down. It was 99 when we left so air conditioner was on the whole ride back. 26 MPG home. 87 octane.
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Old 07-01-2015, 09:44 PM   #18
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3.73's w/ long tubes, udp, cmdp, x-pipe/cat delete, bama race tune and I get about 18.3 combined city/hwy spirited driving. About 24 highway driving at a steady 70 and about 21 at 80-85.
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Old 07-06-2015, 07:54 PM   #19
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How are you calculating your MPG? Are you doing it yourself, or are you trusting the computer?

Did you disconnect the battery at any point in that time? Are you driving the same exact roads as before? Same air temp, tire pressure, wind speed, net vehicle weight?
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