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Old 01-19-2013, 03:59 PM   #3051
Angelus911
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Originally Posted by imprzya View Post
I drove my Sti to work last week, 21mpg, the week before driving my Impreza 23.6mpg. I'm definitely disappointed with the mileage. I just had the reflash done on Thursday, I'll report back next week after another week of my normal commute.

But seriously why isn't this car getting significantly better mileage than my sti
Probably has something to do with the reflash you just got a couple days ago. I would wait a week for the car to relearn
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Old 01-19-2013, 04:12 PM   #3052
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I believe that the MPG is related to the low torque that the 2.0i produces. If you are a bit tender with the right pedal, this prevents high RPMs and resultant low MPG. I have had the dealer adjust the dash display downward by 6%. Now my hand calculated MPGs is within .3 MPG to what is displayed - display is now mostly low. Even so, my son is getting somewhere around 25/26 MPG and I am getting a couple MPG higher now that it is wintertime. This is for 50/50 street and interstate driving. If I "step on it" entering the interstate, I see an immediate .3 MPG loss. Best MPG for me was about 38 MPG on country roads last summer. I too was expecting about 30 MPG in urban environment; however, that has not panned out. I use 10% ethenol (89 grade here). I have tested a couple of tanks of E0 and that provided about 1.5/2 MPG gain. Overall it is what it is and something that I will have to live with. MPG on this car is better than that observed on my 2008 OBS with a 4AT. Wish the gas tank held a few more gallons of gas, though.
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Old 01-19-2013, 04:32 PM   #3053
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Originally Posted by G-Omaha View Post
I believe that the MPG is related to the low torque that the 2.0i produces. If you are a bit tender with the right pedal, this prevents high RPMs and resultant low MPG. I have had the dealer adjust the dash display downward by 6%. Now my hand calculated MPGs is within .3 MPG to what is displayed - display is now mostly low. Even so, my son is getting somewhere around 25/26 MPG and I am getting a couple MPG higher now that it is wintertime. This is for 50/50 street and interstate driving. If I "step on it" entering the interstate, I see an immediate .3 MPG loss. Best MPG for me was about 38 MPG on country roads last summer. I too was expecting about 30 MPG in urban environment; however, that has not panned out. I use 10% ethenol (89 grade here). I have tested a couple of tanks of E0 and that provided about 1.5/2 MPG gain. Overall it is what it is and something that I will have to live with. MPG on this car is better than that observed on my 2008 OBS with a 4AT. Wish the gas tank held a few more gallons of gas, though.
Agreed, I wish they would have offered the 2.5l engine from the forester in this car. I bet real world gas mileage would actually be better with the bigger engine.
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Old 01-19-2013, 05:46 PM   #3054
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Agreed, I wish they would have offered the 2.5l engine from the forester in this car. I bet real world gas mileage would actually be better with the bigger engine.
The FB25 delivers 1 more MPG than the EJ25 in the Forester. If it does something similar for the Impreza, that's still significantly worse than the FB20. The smaller FB16 is even more efficient.
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Old 01-19-2013, 06:02 PM   #3055
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Made a 400 mile round trip today down the interstate to pick up some rims for winter tires. 36.6 on the winter blend. The cold has really taken a bite out of the numbers when running locally, but I'll live with that. They're on the car now with a set of Blizzak's. I guess we'll see what that does to fuel economy.

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Old 01-19-2013, 08:03 PM   #3056
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I pass people all the time going 10 or 15 mph below the speed limit on my commute. It's hardly inconceivable that those people bragging about high 30's or low 40's just drive really, really, slowly.

The real test is how they compare in real world driving compared to the EPA numbers by independent testers - and we've already seen how the Impreza is two standard deviations below a sampling chosen by a mpg defender...

Anybody can get anything depending on how they drive. I can get 50 mpg if I drive slowly enough. The fact of the matter is those with 5 speeds just have no clue how poorly the cvt does on gas, and those who ridicule people honestly trying to figure out what's wrong are just idiots.

wait wait wait....

you pass people who are going 10-15 under the limit? i thought you said that if you were to do that you would die because it is unsafe, yet others can manage to do it?
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Old 01-19-2013, 08:04 PM   #3057
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5dr with CVT, 5k months ownership and just under 3k miles a month, i travel 30 miles a day to and from work and lots of errands for my folks. On average im lucky to break 30MPG on a tank, however when I drive conservatively (58 - 65 mph) on the highway i am usually getting 33MPG on those tanks.
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Old 01-20-2013, 01:17 AM   #3058
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I totally agree. That is why the best snapshot is the 1.5 million miles tracked on Fuelly. Overall average of 27.7mpg combined. Mix of 5 Speeds and CVT's.

Within 1-2 mpg of the average expected for 5 speeds and CVT's (5 speeds=28, CVT=30).
Too bad it doesn't compare favorably with other brands on Fuelly compared with EPA estimates.
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Old 01-20-2013, 01:23 AM   #3059
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wait wait wait....

you pass people who are going 10-15 under the limit? i thought you said that if you were to do that you would die because it is unsafe, yet others can manage to do it?
Flyboy, you are the master of contextomy. Well, in your own mind anyway...
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Old 01-20-2013, 01:35 AM   #3060
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Originally Posted by G-Omaha View Post
I believe that the MPG is related to the low torque that the 2.0i produces. If you are a bit tender with the right pedal, this prevents high RPMs and resultant low MPG. I have had the dealer adjust the dash display downward by 6%. Now my hand calculated MPGs is within .3 MPG to what is displayed - display is now mostly low. Even so, my son is getting somewhere around 25/26 MPG and I am getting a couple MPG higher now that it is wintertime. This is for 50/50 street and interstate driving. If I "step on it" entering the interstate, I see an immediate .3 MPG loss. Best MPG for me was about 38 MPG on country roads last summer. I too was expecting about 30 MPG in urban environment; however, that has not panned out. I use 10% ethenol (89 grade here). I have tested a couple of tanks of E0 and that provided about 1.5/2 MPG gain. Overall it is what it is and something that I will have to live with. MPG on this car is better than that observed on my 2008 OBS with a 4AT. Wish the gas tank held a few more gallons of gas, though.
On highway hills my Impreza will wind up to 6,000 rpm to maintain speed, and yes, during that time it's getting much less than 20 mpg (on my Scangauge). Was your E0 premium? I think that with an engine designed for regular, putting premium in it will lower the mpg - at least that's been my consistent experience - due to the slower burn missing out on optimal energy transmission to the crankshaft in the combustion stroke. I think with E0 regular, I will hopefully see more than a 2 mpg gain. I hope to see that next week - if these guys are accurate:

http://pure-gas.org/
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Old 01-20-2013, 08:17 AM   #3061
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Stevedippydohnm,

Your own post stating it is dangerous to drive under the limit,

http://forums.nasioc.com/forums/show...&postcount=245
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Old 01-20-2013, 08:40 AM   #3062
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uphill 6k rpm damn just speed up and maintain your speed, I keep the same rpm uphill unless i want to downshift and take off. use paddle shifters
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Old 01-20-2013, 08:44 AM   #3063
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I made an interesting observation yesterday during my trip. Somewhere in these pages, it was mentioned using the paddle shifters more to keep the car at a lower rpm. (Not available on base.) Doing that on the way to work does in fact drop the rpm when the puter is still in its warm up cycle. There doesn't appear to be an adverse effect on the eco gauge on fairly level road.

What I noticed going down the interstate, (with a pretty good headwind), was when I did that on a grade, the eco gauge, (in the old days it was a vacuum gauge), dropped lower than letting the engine rev a bit higher to overcome the hill and head wind by leaving it alone. That would suggest that letting the puter control the CVT is more economical than the other way around.

Disclaimer: I'm not sure the eco gauge is exactly like a vacuum gauge of old, but it is telling you similar things.

Another note. Jan, whom I had mentioned recently got a 2013 Impreza Sport, who also has been less than enamored with her fuel economy called me to say she feels much better with it. Seems she needed to take her mom someplace yesterday which involved a fair amount of freeway and achieved the numbers that are published. All I'm saying is that here is someone who was dis-satisfied now realizes she IS getting what she should be when everything is right.

It is pretty obvious by reading back through here that, (as previously mentioned), the cold weather knocks the he** out of the economy along with other factors.

As for myself, I have always figured that as long as I can actually achieve the highest number published for the car, then it is performing as it should. Of course it only goes down from there. How far depends on many things.

And no, I still do not dispute others are not achieving what they expect, but Jans situation is indeed interesting since she is (was) in the unhappy camp. Me, if I get the same in my every day as the rex I'm happy since I am saving on premium vs. regular.


John
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Old 01-20-2013, 08:46 AM   #3064
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Must be a pretty steep hill to get up to 6K. I have never seen more than 4 letting the CVT do its thing.

John
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Old 01-20-2013, 08:52 AM   #3065
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Here's a theory that I'm wondering about:

In the winter time, I commonly leave my climate controls set at one of the defrost settings (either full defrost, or the split defrost with half the air blowing at the windshield and half blowing at your feet).

I haven't listened for the compressor yet, but does anyone know if the split defrost setting engages the A/C compressor? On other brands of cars I've had, engaging defrost would automatically turn on the A/C and would light the A/C light so that you'd know it was on. On the Impreza, I know that full defrost engages the A/C (without lighting the A/C light). I don't know if the split defrost engages the A/C.

I wish Subaru would design the car so the A/C light turns on whenever the A/C compressor is engaged, even when using defrost in the winter time.

We all know that driving with the A/C on takes a toll on MPGs. Is it possible that some of you who are unhappy with your MPGs are driving all the time with the A/C compressor on, and don't even know it?
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Old 01-20-2013, 09:00 AM   #3066
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If the control is set on defrost or defrost/floor it will engage the A/C compressor automatically as needed (it does not run constantly, but cycles on and off).

There is no way around this, it is engineered to engage without lighting up the A/C light because too many morons among us think A/C is only to get cold air in the summer, and would freak out if they saw that light come on in the winter, and try to shut if off, and call the dealer, etc.

It comes on because A/C dehumidifies the air, along with cooling it. In the winter it is used to dehumidify the air before the heater core heats it, so the defrost works more quickly to defog the windows. In the old days you had to be aware of this and turn on the A/C yourself, now most manufacturers have automated the process.

On a really cold day, the moisture from your breath will freeze to the inside of the windshield. Dehumidifying the air with defrost handles this very quickly.

So it is possible people are driving around with it on, but it is equally possible that they are discounting the effects of speed, rapid acceleration, steep grades, cold engine temperatures, stop and go traffic, snow tires, and ethanol gas blends...
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Old 01-20-2013, 09:02 AM   #3067
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Back in the, ahem.., good old days, the only time the ac compressor cycled was when the lever was in the ac position. It was common for the system to go bad due to inactivity. Note an old fridge in the kitchen that has run for 40 years without any trouble. Let it sit for several months and the gas will settle and crystalize. I do not know how the new refrigerant performs though. I'm speaking of R-12. Maybe someone here knows how R-134 acts.

So, yes the compressor cycles when the car is in the defrost setting and I think maybe in the hi/low setting for feet and windshield. How much and how often I don't know. Yes, that would also contribute to load on the engine. Another thing is when the alternator is working hard to produce electricity. Higher loads cause more drag.

John
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Old 01-20-2013, 09:05 AM   #3068
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Originally Posted by sgoldste01 View Post
Here's a theory that I'm wondering about:

In the winter time, I commonly leave my climate controls set at one of the defrost settings (either full defrost, or the split defrost with half the air blowing at the windshield and half blowing at your feet).

I haven't listened for the compressor yet, but does anyone know if the split defrost setting engages the A/C compressor? On other brands of cars I've had, engaging defrost would automatically turn on the A/C and would light the A/C light so that you'd know it was on. On the Impreza, I know that full defrost engages the A/C (without lighting the A/C light). I don't know if the split defrost engages the A/C.

I wish Subaru would design the car so the A/C light turns on whenever the A/C compressor is engaged, even when using defrost in the winter time.

We all know that driving with the A/C on takes a toll on MPGs. Is it possible that some of you who are unhappy with your MPGs are driving all the time with the A/C compressor on, and don't even know it?
You can hear it outside the car when it engages. I run the split mode from probably mid oct-mid april. It is probably an additional 5% loss
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Old 01-20-2013, 09:44 AM   #3069
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You can hear it outside the car when it engages. I run the split mode from probably mid oct-mid april. It is probably an additional 5% loss
Right. So maybe people who are dissatisfied with their MPGs should consciously avoid both of the defrost settings unless the windows are really fogging up. Five percent is significant.
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Old 01-20-2013, 09:55 AM   #3070
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Stevedippydohnm,

Your own post stating it is dangerous to drive under the limit,

http://forums.nasioc.com/forums/show...&postcount=245
Like I said, in your own mind...


http://www.google.com/search?q=speed...ffic+accidents
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Old 01-20-2013, 12:19 PM   #3071
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Originally Posted by sgoldste01 View Post
Right. So maybe people who are dissatisfied with their MPGs should consciously avoid both of the defrost settings unless the windows are really fogging up. Five percent is significant.
I am aware that the A/C goes on when the HVAC setting is set for defrost and split floor/defrost, so that is not a contributing factor to my problem. Wish it was
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Old 01-20-2013, 12:38 PM   #3072
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Originally Posted by stevehnm View Post
On highway hills my Impreza will wind up to 6,000 rpm to maintain speed, and yes, during that time it's getting much less than 20 mpg (on my Scangauge). Was your E0 premium? I think that with an engine designed for regular, putting premium in it will lower the mpg - at least that's been my consistent experience - due to the slower burn missing out on optimal energy transmission to the crankshaft in the combustion stroke. I think with E0 regular, I will hopefully see more than a 2 mpg gain. I hope to see that next week - if these guys are accurate:

http://pure-gas.org/
The E0 that I was using was regular @87 rating. I'm too cheap to try the 91/93 stuff. You will need to discount the first tank, then run that almost dry and accomplish your calculations on the next two (or more) tanks to insure that the E10 has been sufficiently diluted with the new E0. The MPG gains will vary dependent on a variety of factors. I used BP gas, as that brand normally provides me with the best MPG.
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Old 01-20-2013, 10:56 PM   #3073
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The E0 that I was using was regular @87 rating. I'm too cheap to try the 91/93 stuff. You will need to discount the first tank, then run that almost dry and accomplish your calculations on the next two (or more) tanks to insure that the E10 has been sufficiently diluted with the new E0. The MPG gains will vary dependent on a variety of factors. I used BP gas, as that brand normally provides me with the best MPG.
Actually it seems to me that if the tank is 90% empty and I fill it with E0 then it will effectively have E01 (1% ethanol) and will be close to the performance of E0. Is that not true?
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Old 01-20-2013, 11:05 PM   #3074
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Originally Posted by vwgti123 View Post

I am aware that the A/C goes on when the HVAC setting is set for defrost and split floor/defrost, so that is not a contributing factor to my problem. Wish it was
How is it not contributing when it drops your mpg an additional 1-1.5 mpg?
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Old 01-21-2013, 12:00 PM   #3075
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This is kinda related to this thread.

Someone said an engine coolant heater was really expensive if you found the one specific to the 2012, but found a generalized one on the subaru website somewhere, for like $30. Does anyone know where to find that? And how much would it cost to have a dealer install it?
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