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Subaru Legacy/Outback: MPG-Real World Numbers

98 messages,  Last post on Jul 29, 2009 at 7:46 AM

You are in the Subaru Legacy & Outback Forum. Your Host is kcram

What is this discussion about? Subaru Outback, Fuel Efficiency (MPG), Sedan, Wagon


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#69 of 98
Re: 1997 Outback Ltd automatic - 23 lifetime [robsis] by xwesx
Dec 15, 2008 (11:01 am)
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Replying to: robsis (Dec 14, 2008 8:39 pm)

What is the mileage on the 1997? Often with high mileage engines, in addition to those things noted above, cleaning out the vacuum system (such as PCV valve and hoses) and replacing oxygen sensors will yield better fuel economy and performance.
#70 of 98
Re: 1997 Outback Ltd automatic - 23 lifetime [xwesx] by kidali
Dec 15, 2008 (12:17 pm)
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Replying to: xwesx (Dec 15, 2008 11:01 am)

The plugs were changed in january, along with ignition wires... so should still be fine. Only things I had thought of were air filter/ gas filter/ oil change.
Thanks for the info on vaccuum system and O2 sensors. Will check it out.
 
On a similar note, my gas gauge is giving severely faulty readings. From a full tank, I'll get 200k (approx 125 miles) and it will register as only a quarter tank left. I go to fill up, expecting a hefty bill, only to get $18 worth.
Is this my fuel pump? I also get a 'whirring' noise somewhere in the back of the car when accelerating over certain rpms. First I thought it was something to do with the awd system. Now I'm wondering if it's the fuel pump doing strange things.
 
Any idea what this would cost to repair?
#71 of 98
Re: 1997 Outback Ltd automatic - 23 lifetime [kidali] by xwesx
Dec 15, 2008 (2:07 pm)
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Replying to: kidali (Dec 15, 2008 12:17 pm)

Hmmm.... that 'whirring,' does it do it whenever you increase the RPM on the engine, or only when actually driving (i.e., car in motion)? If it happens when the car is in motion, I have to wonder if it is a noise from the rear differential rather than the fuel pump.
 
On my 1996 Outback, the fuel gauge would drop much faster from F to 1/2 than on the second "half" of the gauge. I estimate that a fill up at 1/2 on the gauge would result in about 5.5 gallons, whereas 1/2 to E would result in an additional 8 gallons. This is not as drastic as you state, but it may, in part, be due to tank shape, gauge calibration, or..... ?
#72 of 98
Re: 1997 Outback Ltd automatic - 23 lifetime [xwesx] by kidali
Dec 17, 2008 (11:52 am)
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Replying to: xwesx (Dec 15, 2008 2:07 pm)

The whirring seems to be when I'm accelerating past 95km/h (about 55mph)
Actually, it's also at about 45km/h (30mph). I think you're right though. Sounds like something in the drivetrain? Differential?
 
Mileage isn't exactly horrible, so I'll forgo any work now and will wait till spring.
#73 of 98
Re: 1997 Outback Ltd automatic - 23 lifetime [xwesx] by kidali
Jan 14, 2009 (1:13 pm)
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Replying to: xwesx (Dec 15, 2008 11:01 am)

I'm now down to 17mpU.S.g (13.8L/100km) at about 80%highway/ 20% city, and I've been ultra careful about fast starts, and sticking around 60mph (100km/h).
Terrible.
Tires are balanced and inflated properly.
Maybe it's the cold weather, but wow, at that mixture of highway/city driving, my old 22 year old junk box of a Camry would yeild me double that mileage. I'm not kidding.
I know I've moved up to all-wheel drive, and a much heavier car and bigger 4cylinder engine, but I do believe even for the Subaru that something's wrong.
Wires, plugs etc were replaced a year ago by previous owner.
Any ideas? What are others getting out of their 97's? Maybe I should just take the thing to a Subaru dealer. I'm scared of getting screwed over in repairs that will get me little gains in mileage.
#74 of 98
Re: 1997 Outback Ltd automatic - 23 lifetime [kidali] by xwesx
Jan 14, 2009 (2:09 pm)
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Replying to: kidali (Jan 14, 2009 1:13 pm)

Well, assuming no major parasitic losses in the drivetrain (which should be noticeable), you may need to look at your vacuum system. If it is gunked up and airflow is obstructed, your efficiency is going to go way down. The PCV valve may need replacement, or you might need to run a can (or two) of SeaFoam through the engine, drawn directly into the vacuum system. Also, if your oxygen sensors are fouled and not providing accurate feedback to the engine, you will experience reduced efficiency.
#75 of 98
Re: 1997 Outback Ltd automatic - 23 lifetime [xwesx] by kidali
Jan 14, 2009 (7:16 pm)
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Replying to: xwesx (Jan 14, 2009 2:09 pm)

Thanks.
I guess I'll take it to a subaru dealer. :S
#76 of 98
Mileage by jccinoh
Jan 16, 2009 (4:28 am)
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Purchased a 2009 2.5i OB automatic about 1 month ago (510 miles). So far the display is showing 24.3 mpg. The vast majority of that would be considered 'city' driving. Although quite happy with the mileage I would tend to think this will increase slightly once the car is broken in.
#77 of 98
Re: Mileage [jccinoh] by ateixeira
Feb 03, 2009 (11:45 am)
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Replying to: jccinoh (Jan 16, 2009 4:28 am)

That's good for city driving. I bet you'll break 30 on some trips if you keep the speeds down.
#78 of 98
Re: Mileage [ateixeira] by jccinoh
Feb 05, 2009 (8:42 am)
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Replying to: ateixeira (Feb 03, 2009 11:45 am)

That would be nice! My city driving mileage is now up to 24.9mpg (950 miles)

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