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Old 08-03-2015, 07:37 AM   #1
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Poor mileage (25mpg) on 2014 SE HB with DCT...suggestions?

I've gone from about 30-31mpg of mixed (75% city, 25% highway) driving to 25-26mpg, despite the fact that it's summer and (I thought) fuel economy would improve.

Original owner, 2014 SE hatchback with PowerShift DCT transmission. 14xxx miles, less than a year old. Built after the transmission TSB date range and it doesn't seem to be acting up, so the clutch problem likely isn't an issue. Driving habits are the same: 75% city, 25% highway, fairly consistent acceleration, tires at proper inflation. 87 octane almost always from BP station with good reputation. Most recent oil change 4k miles ago (at 10k).

I realize that the most common cause of poor mileage is poor driving habits. Combine hard acceleration, city driving, cold weather, and underinflated tires and you're going to have bad fuel economy.

But I also realize that if nothing else has changed, poor mileage could be an indicator of an issue somewhere along the line and that's what I want to figure out. I don't know why it's gotten consistently worse from winter to summer when nothing else has really changed. Suggestions on things to check out?


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Old 08-03-2015, 09:57 AM   #2
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With the heat were having , have you tried 93 to see if it improves ?

Last oil change ?
Last Filter change ?

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Old 08-03-2015, 11:28 AM   #3
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Quote:
Originally Posted by 1turbofocus View Post
With the heat were having , have you tried 93 to see if it improves ?

Last oil change ?
Last Filter change ?

Tom
I have not tried 93...I know the cold affects fuel economy, but I didn't think about the heat affecting it as much.

As for the oil change, it was ~4k miles ago (at 10k) with a Purolator PureONE PL10241 filter and Mobil1 5W-20 full synthetic.
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Old 08-03-2015, 11:52 AM   #4
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Are you solely relying on your computer for your mileage calculations? I've noticed mine has been way off all summer. Having said that, if you were relying on what your computer was telling you, it still wouldn't explain the change.

Have you been running with your AC on? Pretty big difference for AC to account for, but it may not be helping.
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Old 08-03-2015, 12:20 PM   #5
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Use 93 octane and cruise control as much as possible. I get 25 mpg from crappy 87 octane fuel and driving like a dick. I also get 29 to 30 mpg from premium and driving conservatively with cruise control. And this is all the same routes to and from work, house, gym,etc.
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Old 08-03-2015, 12:39 PM   #6
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Quote:
Originally Posted by Peregriner View Post
Are you solely relying on your computer for your mileage calculations? I've noticed mine has been way off all summer. Having said that, if you were relying on what your computer was telling you, it still wouldn't explain the change.

Have you been running with your AC on? Pretty big difference for AC to account for, but it may not be helping.
I eyeball the computer, but record each fillup and odo reading using Fuelly. The computer actually said I was getting BETTER fuel economy than I have been calculating with Fuelly. The thing is, even if I have wild variations in fueling (eg. I don't fill the tank all the way full one time and then top it off perfectly the next), the mileage would even out over time even if the individual tank's mileage was off. I almost always fill up at the same time of the day (very late afternoon or early evening), so there's little to no variation there.

Definitely running the AC. Not usually on max fan, but usually medium with max cold.

Quote:
Originally Posted by Whitanium2013 View Post
Use 93 octane and cruise control as much as possible. I get 25 mpg from crappy 87 octane fuel and driving like a dick. I also get 29 to 30 mpg from premium and driving conservatively with cruise control. And this is all the same routes to and from work, house, gym,etc.
Cruise is difficult in the city due to the stop lights, but I can give it a shot. Might as well try out 93, too...pretty sure it will cost more than it will save even if the fuel economy improves (93 is 40 more than 87 per gallon here), but at least I can see if that makes a difference. Just seems strange that I've never experienced this in any other car I've owned before.

I appreciate the advice!
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Old 08-03-2015, 03:02 PM   #7
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Quote:
Originally Posted by rczrider View Post
I eyeball the computer, but record each fillup and odo reading using Fuelly. The computer actually said I was getting BETTER fuel economy than I have been calculating with Fuelly. The thing is, even if I have wild variations in fueling (eg. I don't fill the tank all the way full one time and then top it off perfectly the next), the mileage would even out over time even if the individual tank's mileage was off. I almost always fill up at the same time of the day (very late afternoon or early evening), so there's little to no variation there.

Definitely running the AC. Not usually on max fan, but usually medium with max cold.


Cruise is difficult in the city due to the stop lights, but I can give it a shot. Might as well try out 93, too...pretty sure it will cost more than it will save even if the fuel economy improves (93 is 40 more than 87 per gallon here), but at least I can see if that makes a difference. Just seems strange that I've never experienced this in any other car I've owned before.

I appreciate the advice!
AC still shouldn't make that much of a difference. Probably as much as having all the windows down killing your aero bubble ... which I do and it doesn't seem to affect my performance (I got 37.6 on a tank with all windows down ...). There has to be something else at work ... Did you check your grill shutters? Cruise will only go so far ... the only reason it "improves MPGs" is because it keeps your engine at generally low and constant RPMs ... if you are good at maintaining a constant speed, then it won't help you too much. Of course that all goes out the window when there are hills. Hmmmm ... I am running out of ideas.
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Old 08-03-2015, 03:10 PM   #8
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Originally Posted by Peregriner View Post
AC still shouldn't make that much of a difference. Probably as much as having all the windows down killing your aero bubble ... which I do and it doesn't seem to affect my performance (I got 37.6 on a tank with all windows down ...). There has to be something else at work ... Did you check your grill shutters? Cruise will only go so far ... the only reason it "improves MPGs" is because it keeps your engine at generally low and constant RPMs ... if you are good at maintaining a constant speed, then it won't help you too much. Of course that all goes out the window when there are hills. Hmmmm ... I am running out of ideas.
Grill shutters? No idea about those!
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Old 08-19-2015, 08:33 AM   #9
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Will be keeping an eye on this thread as my MPG has been poor as well.
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Old 08-19-2015, 01:37 PM   #10
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One thing I've found is my car doesn't like going below 50mph for fuel economy. As soon as I'm above 50 my mpgs go up pretty quick. Problem is I have a short commute to work with nothing above 40mph typically. My wife has a '14 automatic and it's the same way. Hers is bone stock. Mine isn't so I'd have to say it's weather/speed/stop&go/etc that's causing the issue of bad fuel economy. I have a new filter, had a recent oil change and I'm still seeing 22-27 mpg in city.
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