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Old 06-18-2010, 07:32 PM   #1 (permalink)
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Unhappy need help with Subby impreza 2010 MPG

My impreza gets poor mileage(average 22mpg) i read all the forums increased my tire pressure,changed my driving style based on this forum, got a scan gauge II and was able to get the MPG to about 24.5 MPG some times as high as 27.

I am easy on the gas and have been really trying to get to mid 30s on mileage. I need your help.

what about ECU tuning? do you know anyone that does it in New York?

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Old 06-18-2010, 09:17 PM   #2 (permalink)
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there is an outback here with similar ej engine...

is the impreza turbo?

I run old subes for the eco stuff. singular point injection maxxed at 38mpg (limts of gadgetry).
add three injectors, twice as many valves, a smaller oil pump, two more main bearings...on an engine that dfoes not keep solid state momentum.....yikes.
the impreza at occasional 27 may be the best it has to squeeze out already. I would not complain. if you seek longevity and a bit cleaner/cooler/less pollutant, the sube and EGR hate each other, you may be able to block it off.

2 valve heads and carb would bring into what you want...

just not likely with todays setups.
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Old 06-18-2010, 09:35 PM   #3 (permalink)
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Welcome to the site vcestone.

What is your normal commute like? Unless its truly bad traffic all the time you should be able to eek out 30 mpg with conservative driving. The first thing to look at is brake usage. Any time you use the brakes, think of how you could avoid it in the future. If you have a manual transmission, try to accelerate around 80% load (LOD on the scangauge) and keep the rpms low (I stay under 2k most of the time, but a little higher won't hurt that much). Other than that, stick to the speed limit and if you see a red light put it in neutral as soon as you can. Honestly, just doing those things should get you very close if not over 30 mpg (unless you're in bad traffic real often).
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Old 06-18-2010, 10:12 PM   #4 (permalink)
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Thanks bgd73 and Daox

my sube is a non turbo 2.5 automatic. my drive is mostly highway (about 15 miles about 5mile in town) I have been shifting my auto manually at as low an RPM as it will let me. I currently(for the summer) have the 4 wheel drive turned off. I have no traffic to deal with.

My old car a Saturn sc1 I was getting about 40MPG with the same drive.
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Old 06-19-2010, 11:05 AM   #5 (permalink)
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Turn the AWD back on. That fuse does absolutely nothing for mileage, and there are scattered reports on other subie forums that long term use of it can damage the clutch pack. It wasn't designed to be left off for more than a few miles.

Are you keeping your speed down? What's your A/C usage? How many miles on the car? Whens the last time you had a tune up?
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Old 06-19-2010, 11:43 AM   #6 (permalink)
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I would seriously hope a 2010 wouldnt already need a tuneup...
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Old 06-19-2010, 12:16 PM   #7 (permalink)
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Much as I like Subarus -- considering the fact that I have 3 of them that's pretty much -- they're not going to win any fuel efficiency awards.

Stop/go driving is absolute death for fuel efficiency in Subies. Getting all that AWD stuff spinning takes energy and there is no way around it. Other forums I've been on are commonly found with people griping about poor gas mileage in stop/go city driving.

Pump the tires up to sidewall max, try not to stop, and remember all the other great qualities Subarus have.
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Old 06-20-2010, 01:12 AM   #8 (permalink)
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Yeah, I can't do that well in city driving even trying my best (24 mpg tops in city)

But on the highway, I'm getting close to 40 mpg regularly.

In a heavier bigger car than his too. (Same motor though)
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Old 06-20-2010, 01:53 PM   #9 (permalink)
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Removing extra weight and EOCing will help.
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Old 06-27-2010, 01:34 PM   #10 (permalink)
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AWD is really going to hurt you mileage. I would suggest a nice tune up, tire pressure adjustment (get it as high as you can SAFELY do), ride with the A/C off, dump the extra weight... most importantly look over the hypermile tips and increase the effectiveness of your driving style.

Stay on the highway and out of the stop-and-go traffic as much as you can. Honestly, I don't think impreza's get that great of gas mileage from the factory.

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