4.6-19.5 MPG??????? - Mustang Evolution

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Old 07-15-2013, 02:33 PM   #1
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4.6-19.5 MPG???????

Hey, I have a 14' GT Manual completely stock and my MPG gauge was staying consistent at 14.7-14.8 MPG. I had the dealer change the oil today at 1,000 miles (this is all city miles, wanted to keep it under 55 for the first 1,000). On the way home my MPG gauge started at 4.6 and ended at 19.5 MPG. The dealer is 10 miles from my house and is all city driving. Are these average MPG gauges accurate or not? I have a hard time believing a 5.0 V8 with 420 horsepower can get 19 MPG around town. Thanks.
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Old 07-15-2013, 02:36 PM   #2
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It's about as accurate as it can be. Given 10 miles of data that's about as accurate as possible. It's those other 300 miles that even it out.
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Old 07-15-2013, 02:36 PM   #3
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These newer powerful engines are surprisingly economical.
The coyote is one mean machine
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Old 07-15-2013, 04:45 PM   #4
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19 is easily feasible. I do a good 50-50 mix of city and highway driving, and after 8k miles I'm averaging 20.8
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Old 07-15-2013, 04:46 PM   #5
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those MPG displays are never accurate in any car I have owned with one. It changes as soon as you hit reset. For real MPG you gotta go old school and actually do the math when you fill up. And yes, the 5.0 is suprisingly fuel efficient. For half city and half highway daily commute i am between 19 and 21 every fillup....and my MPG display is always around 17....
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Old 07-15-2013, 04:53 PM   #6
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I average 300-310 miles per full tank of gas in my 5.0. That would translate to 22.something, but I drive alot of highway miles.
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Old 07-15-2013, 05:45 PM   #7
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I've averaged 19.7 mpg over 6000 miles so far and I check the mpg's every time I fill up. It's pretty close to being accurate. Maybe a tenth or 2 off from time to time.

So what you're seeing is perfectly normal. Glad to see your mpg's shot up from just under 15.
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Old 07-15-2013, 07:03 PM   #8
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I've averaged 19.7 mpg over 6000 miles so far and I check the mpg's every time I fill up. It's pretty close to being accurate. Maybe a tenth or 2 off from time to time.

So what you're seeing is perfectly normal. Glad to see your mpg's shot up from just under 15.
Yeah me too, I just didn't expect to get 19 MPG with 420 horses, though I do baby it 95% of the time.
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Old 07-15-2013, 07:15 PM   #9
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I run the dog chit outta mine and still get 17mpg. Compared to my trucks, it's like driving a 420hp hybrid.
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Old 07-15-2013, 07:34 PM   #10
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Yeah. I was averaging 18.9 for the longest. And I check the math and resetting the avg on the car every time I filled up. Here lately I've kinda been like. I bought a V8 for a reason. And now I get around 14-15 mpg. So it's deff all in how you drive. I hit 19 mpg a couple times. I'm sure if you went all highway you get into the low 20's.
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Old 07-15-2013, 08:26 PM   #11
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those MPG displays are never accurate in any car I have owned with one. It changes as soon as you hit reset. For real MPG you gotta go old school and actually do the math when you fill up. And yes, the 5.0 is suprisingly fuel efficient. For half city and half highway daily commute i am between 19 and 21 every fillup....and my MPG display is always around 17....
In my car it manually calculates a half gal higher than the gauge. Pretty accurate
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Old 07-15-2013, 10:46 PM   #12
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In my car it calculate a half gal higher than he gauge. Pretty accurate
Ummm......what?
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Old 07-15-2013, 10:49 PM   #13
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Ummm......what?
If my mpg gauge says 22.5 and I manually calculate it by miles divided by gala s it comes out 23. Consistently
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Old 07-16-2013, 08:35 AM   #14
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to mileage-miser this engine you need to REALLY baby it. This isn't surprising, it's still a relatively large V8 with a lot of power.

In the summer, my mileage hits the skids...what a surprise.
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Old 03-27-2014, 06:13 AM   #15
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Mine says 11.4 mpg right now. Wtf I'm doing wrong? I just got it less than month ago that's 360 miles. It had only 93 maybe 98 miles on it. When I got it.

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Old 03-27-2014, 09:13 AM   #16
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Mine says 11.4 mpg right now. Wtf I'm doing wrong? I just got it less than month ago that's 360 miles. It had only 93 maybe 98 miles on it. When I got it.

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ummm thats aweful. My car gets great mileage. Around 24 on good day. Are you beating the dog crap out of it? I barely get on the throttle unless given the opportunity. The coyote is a beast. Cruise it doesn't need much but it's one thirsty son of a ***** when you start playing with it.
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Old 03-27-2014, 11:11 AM   #17
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Excessive idle time will also kill your MPG.
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Old 03-27-2014, 11:58 AM   #18
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I gotta 4.6 and i get from 19.6-20.4 mpg. Those are mostly highway miles and a small portion of city. Ion push it like dat tho unless its a clean shot fo a hot min. Im about to get a K&N air filter kit dat would prob save a couple mpgs.
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Old 03-27-2014, 05:54 PM   #19
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I found out after reading all of yours. Glad I did, I'm getting now 15.4 mpg better but, needs improvement.

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Old 03-27-2014, 08:44 PM   #20
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I gotta 4.6 and i get from 19.6-20.4 mpg. Those are mostly highway miles and a small portion of city. Ion push it like dat tho unless its a clean shot fo a hot min. Im about to get a K&N air filter kit dat would prob save a couple mpgs.
K&n only hurt fuel economy, stock is the way to be for MPG.
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Old 03-27-2014, 09:01 PM   #21
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If I baby my 3v 4.6 I can manage 19.0 mpg. On the highway my max is 30.0.

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K&n only hurt fuel economy, stock is the way to be for MPG.
For me I went from 18 to 19 mpg street, and 27 to 30 mpg highway (just a drop-in K&N).
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Old 03-27-2014, 09:39 PM   #22
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If I baby my 3v 4.6 I can manage 19.0 mpg. On the highway my max is 30.0.



For me I went from 18 to 19 mpg street, and 27 to 30 mpg highway (just a drop-in K&N).
We actually just had a guy on the other forum I am on (all about FE and modifying for aerodynamics/FE) come in and say to get one because of the FE difference. Was any other maintenance done? The EPA reports say the filter really doesn't affect fuel economy, but I have not seen any ABA or stricter testing showing any gain, rather ONLY showing a decrease in FE from it.

Is it possible other variables were involved, or did you use a structured testing procedure? It seems like they are a bit helpful for air flow, but does nothing for FE. Also, the oils used in them sometimes cause some havoc in vehicles. No experience myself- I don't regret my MPG hit for my CAI, no judgement in a K&N- just wouldn't advise for FE.
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Old 03-27-2014, 09:52 PM   #23
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Nope just dropped it right in and threw out the paper filter. Yes I've heard of people over-oiling their filters resulting in a oil-covered MAF but that's about it. FE?
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Old 03-28-2014, 12:29 AM   #24
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I'm gonna try cai a plain one for now than later dyno it.

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Old 03-28-2014, 12:50 AM   #25
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K&n only hurt fuel economy, stock is the way to be for MPG.

Does it add hp??
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Old 03-28-2014, 02:44 AM   #26
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Nope just dropped it right in and threw out the paper filter. Yes I've heard of people over-oiling their filters resulting in a oil-covered MAF but that's about it. FE?
I have heard this issue- but nothing to do with the consumer making adjustments, just from using the filters. FE = Fuel economy

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Does it add hp??
http://www.fueleconomy.gov/feg/pdfs/...02_26_2009.pdf

Shorter and simpler but less detail on process: AutoSpeed - Don't Bother Changing the Factory Filter
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Old 03-28-2014, 07:39 AM   #27
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Nowadays I don't even consider the "gains" from a K&N drop-in filter. Not having to spend $44 on a paper filter every 3 months is a great benefit.
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Old 03-28-2014, 08:48 AM   #28
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I have heard this issue- but nothing to do with the consumer making adjustments, just from using the filters. FE = Fuel economy







http://www.fueleconomy.gov/feg/pdfs/...02_26_2009.pdf



Shorter and simpler but less detail on process: AutoSpeed - Don't Bother Changing the Factory Filter

Wut Kind of air filter kit you recommend fo gaining hp?
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Old 03-28-2014, 09:46 AM   #29
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Wut Kind of air filter kit you recommend fo gaining hp?
None. if we're talking 5.0, there is nothing to be had here. This ain't the '80s anymore.

Now if we are talking a tune + filter, why not just get a tune, because that's where the power is and save the 3 bills for the useless tinsel CAI.
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Old 03-28-2014, 11:47 AM   #30
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Wut Kind of air filter kit you recommend fo gaining hp?
I couldn't speak to that. I will note my CAI (Roush) made WOT feel less restrictive, while the standard box at WOT felt like it was gasping, almost like trying to breathe through a straw. But this came with a decrease in FE. I do not have a tune, nor do I have any dyno numbers. I don't do much in the ways of power, I've got plenty now.
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Old 03-28-2014, 12:15 PM   #31
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Mine did the same thing when the dealer changed the oil yesterday. I got home and it said 21.4mpg. Now it's back down to its usual 18-19. That's combined city and highway with a fair amount of "spirited" driving.
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Old 03-28-2014, 12:27 PM   #32
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That "feels less restrictive" is the extra noise it's making . The factory box and filter flows more cfm than the stock engine can ingest so, adding mass air flow here does nothing. The Boss 302 uses the same box, and it actually pulls more air than the gt will .
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Old 03-28-2014, 01:20 PM   #33
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While on the subject of these mpg gauges, my '14 is the first car I've owned with one of these and I was curious how accurate it is when it says 'xx' miles till empty, anybody ever pushed it beyond this?
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Old 03-28-2014, 01:27 PM   #34
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Don't bet your life crossing Death Valley on it but it's a good guide. I find it generally a bit conservative, which is good. I have taken it right down to zero to run light fuel at the dtagstrip.
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Old 03-28-2014, 08:59 PM   #35
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I couldn't speak to that. I will note my CAI (Roush) made WOT feel less restrictive, while the standard box at WOT felt like it was gasping, almost like trying to breathe through a straw. But this came with a decrease in FE. I do not have a tune, nor do I have any dyno numbers. I don't do much in the ways of power, I've got plenty now.

Well i might get da dyno tune, da kit sounds like its juss for show.
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