Welcome to the North American Subaru Impreza Owners Club Sunday December 21, 2014
Home Forums WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Here you can view your subscribed threads, work with private messages and edit your profile and preferences Home Registration is free! Visit the NASIOC Store NASIOC Rules Search Find other members Frequently Asked Questions Calendar Archive NASIOC Upgrade Garage Logout
Go Back   NASIOC > NASIOC Technical > Service & Maintenance

Welcome to NASIOC - The world's largest online community for Subaru enthusiasts!
Welcome to the NASIOC.com Subaru forum.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, free of charge, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!

If you have any problems with the registration process or your account login, please contact us.
* Registered users of the site do not see these ads.
Reply
 
Thread Tools Display Modes
Old 01-20-2007, 11:13 PM   #1
vipergtrdj
Scooby Newbie
 
Member#: 131770
Join Date: Nov 2006
Vehicle:
2001 Subaru Impreza
Silver

Default bad gas mileage

well I just bought my subaru a week ago. now i didnt get any mantienance records or anything for the car.all i know is all the driving is highway miles and the clutch feels brand new - it pulls great and still has a lot of power.

well i realized today that it was drinking down gas like it was nothing, i look underneath to make sure its not a leak anywhere -- no leaks. it has a 13gallon tank and i can only go between 220-250miles on a tank .. so that calculates to be about 19-20mpg .... my girlfriends car is identical -- and with me driving her car gets anywhere from 23-27mpg .... they both have the 2.2l engines,
i was just wondering why mine is so low on the gas mileage.

Could it be the air filter,oil, spark plugs/wires/ or distributor cap ? would changing any of those help ?
can anyone give me some suggestions please ?

thanks in advanced.
* Registered users of the site do not see these ads.
vipergtrdj is offline   Reply With Quote
Old 01-20-2007, 11:43 PM   #2
Meat Supply
Scooby Specialist
 
Member#: 137902
Join Date: Jan 2007
Chapter/Region: MWSOC
Location: traverse city, Mi skeletor
Vehicle:
hey! Who brought
the chili dogs? Let's eat

Default

yeah, those sound like good places too start, also check fuel filter. air filter
Meat Supply is online now   Reply With Quote
Old 01-21-2007, 12:46 AM   #3
ivwarrior
Scooby Specialist
 
Member#: 100610
Join Date: Nov 2005
Location: Lewistown, PA
Vehicle:
2002 WRX
MBP

Default

Well, considering a Subaru hasn't used a distributer in years, I doubt it's the distributer cap.

If you don't know any of the service history on the car, I'd start with spark plugs (NGK) and wires (OEM) and fuel and air filters, maybe PCV valve just because it's cheap and easy.
ivwarrior is offline   Reply With Quote
Old 01-21-2007, 10:50 AM   #4
vipergtrdj
Scooby Newbie
 
Member#: 131770
Join Date: Nov 2006
Vehicle:
2001 Subaru Impreza
Silver

Default

alright ... thanks.... im gonna do the air filter, then wednesday do the spark plugsand wires......
i didnt know they didnt use distributors ...
vipergtrdj is offline   Reply With Quote
Old 01-21-2007, 12:53 PM   #5
kheff46
Scooby Specialist
 
Member#: 66739
Join Date: Jul 2004
Chapter/Region: MWSOC
Location: Medina, Ohio
Vehicle:
2002 WRX wagon
silver

Default

theres a cap looking thing, but no distributor underneath. but it's direct spark like most new cars.

my MAF had weird effects on my MPG even before it had negative effects at idle. depending on mileage, i'd check that also. swap MAF's from your GF's car to test it maybe? just a thought.

what tire sizes are on both cars? wider has more drag/friction fwiw. lighter wheels would act similar. but thats a stretch having seriously different sizes or weights of wheels between the 2 cars. but is possible, just not probable.

sticky drum brakes in back? mine would stick but make no noise on my old L sedan. noticeable usually in reverse when drum sticks from sitting, then suddenly pops free.

--keith
kheff46 is offline   Reply With Quote
Old 01-21-2007, 02:47 PM   #6
LorenzoS
Scooby Newbie
 
Member#: 50995
Join Date: Dec 2003
Location: Cliffside Park, NJ
Vehicle:
2002 WRX Wagon

Default

Hold on a moment. How exactly are you calculating your mileage again?

You're dividing the number of miles between fill ups by the number of gallons you actually added, correct? Your post makes it sound like you're dividing by the total tank capacity of 13 gallons.
LorenzoS is offline   Reply With Quote
Old 01-21-2007, 02:58 PM   #7
da-chaz
Scooby Newbie
 
Member#: 127256
Join Date: Sep 2006
Chapter/Region: E. Canada
Location: Toronto (GTA), Ontario, Canada
Vehicle:
2006 Impreza 2.5i
SGM

Default

Vipergtrdj, is your car a WRX or an NA RS?

Based on my numbers, my RS (2.5i MY06) gets about 27MPG or 8.7L/100km highway on 87 Octane (I made a post in the the NA forum with all the details if you're interested.

I'm curious as to what is your driving style and shift-points? I've found that Subaru's really do react drastically with different driving styles. I personally commute alot every day so my driving style is quite relaxed.
da-chaz is offline   Reply With Quote
Old 01-21-2007, 09:22 PM   #8
vipergtrdj
Scooby Newbie
 
Member#: 131770
Join Date: Nov 2006
Vehicle:
2001 Subaru Impreza
Silver

Default

i am dividing 13gallons (capacity of the tank when its full) and i ran it to empty this past fillup to see what my mileage was. it was at E and started to spit and sputter like it was out of gas, that was at 237miles on a full tank .... so thats about 18-19mpg .... i believe thats the correct way to calculate it ....

i usually shift about 2500 or so, i try not to go above 3k unless going up a hill then i usually just shift at 3k, but im not taking hills every day. my driving is usually relaxed, i comute a lot to work so i take it easy.
vipergtrdj is offline   Reply With Quote
Old 01-21-2007, 10:01 PM   #9
wrxdrvr
Scooby Specialist
 
Member#: 79222
Join Date: Jan 2005
Chapter/Region: W. Canada
Location: Canada BC
Vehicle:
'09 STi 297.5 WHP
Blue

Default

No, the "correct" way to calculate is dividing the miles you put on, by the gallons of gas you "actually" put in, to fill it up again...
wrxdrvr is offline   Reply With Quote
Old 01-21-2007, 10:16 PM   #10
tangent01
Scooby Newbie
 
Member#: 132069
Join Date: Nov 2006
Chapter/Region: SCIC
Location: Southern California
Vehicle:
2003 WRX
WRB

Default

i get about 20 or less on my wrx, i could probably get more if i drove more conservative
tangent01 is offline   Reply With Quote
Old 01-21-2007, 10:26 PM   #11
sleepless
Scooby Newbie
 
Member#: 135321
Join Date: Dec 2006
Location: Philly
Vehicle:
2004 Impreza 2.5 RS
Blurple

Default

thats about what i get, i never thought anything of it
sleepless is offline   Reply With Quote
Old 01-21-2007, 10:48 PM   #12
Impresario
NASIOC Supporter
 
Member#: 344
Join Date: Sep 1999
Chapter/Region: Tri-State
Location: Long Island, NY USA
Vehicle:
2004 Impreza WRX
Java Black Pearl

Default

Quote:
Originally Posted by vipergtrdj View Post
i am dividing 13gallons (capacity of the tank when its full) and i ran it to empty this past fillup to see what my mileage was. it was at E and started to spit and sputter like it was out of gas, that was at 237miles on a full tank .... so thats about 18-19mpg .... i believe thats the correct way to calculate it ....

i usually shift about 2500 or so, i try not to go above 3k unless going up a hill then i usually just shift at 3k, but im not taking hills every day. my driving is usually relaxed, i comute a lot to work so i take it easy.
Quote:
Originally Posted by wrxdrvr View Post
No, the "correct" way to calculate is dividing the miles you put on, by the gallons of gas you "actually" put in, to fill it up again...
^^^+1
And you shouldn't be running the car to a completely empty tank!!!
Impresario is offline   Reply With Quote
Old 01-21-2007, 10:54 PM   #13
Subie Gal
GC84Ever
Super Moderator
 
Member#: 301
Join Date: Sep 1999
Chapter/Region: NWIC
Location: WA
Vehicle:
1970 FF-1 & '70 Van
02 WRX/01 RS

Default

front 02 sensor

CEL or no.... i bet that it's going or has gone bad....


Just went through this on my 2001....

Jamie
Subie Gal is offline   Reply With Quote
Old 01-21-2007, 11:50 PM   #14
Rexwagon03
Scooby Specialist
 
Member#: 127429
Join Date: Sep 2006
Chapter/Region: MWSOC
Location: Fargo, ND
Vehicle:
2006 Legacy GT Limit
Silver

Default

i was getting 19 in my 2.0L heavily modded. changed the plugs and now i get 24.
Rexwagon03 is offline   Reply With Quote
Old 01-22-2007, 07:36 AM   #15
vipergtrdj
Scooby Newbie
 
Member#: 131770
Join Date: Nov 2006
Vehicle:
2001 Subaru Impreza
Silver

Default

Quote:
Originally Posted by Impresario View Post
^^^+1
And you shouldn't be running the car to a completely empty tank!!!

i only ran it to a completely empty tank this once to see what gas mileage was. didnt think of the other way of doing it lol ill try changing the plugs and see what happens. thanks.
vipergtrdj is offline   Reply With Quote
Old 01-22-2007, 10:14 AM   #16
LorenzoS
Scooby Newbie
 
Member#: 50995
Join Date: Dec 2003
Location: Cliffside Park, NJ
Vehicle:
2002 WRX Wagon

Default

Viper, you don't have to run the tank empty to compute mileage. All you have to do is use the number of gallons actually added from one fill up to the next. That should be right there on the pump and on the receipt.
LorenzoS is offline   Reply With Quote
Old 01-22-2007, 06:11 PM   #17
crampfan
Scooby Specialist
 
Member#: 74321
Join Date: Nov 2004
Chapter/Region: MWSOC
Location: clarksville AR
Vehicle:
2004 wrx wag
black UTEC stg 4

Default

We have found spark plugs, and air filters to be the #1 cause of poor fuel mileage. Also, Fram air filters seem to cause a large loss of fuel mileage. I get well over 300 miles a tank with my modded WRX
crampfan is offline   Reply With Quote
Old 01-26-2007, 08:24 PM   #18
vipergtrdj
Scooby Newbie
 
Member#: 131770
Join Date: Nov 2006
Vehicle:
2001 Subaru Impreza
Silver

Default

Quote:
Originally Posted by crampfan View Post
We have found spark plugs, and air filters to be the #1 cause of poor fuel mileage. Also, Fram air filters seem to cause a large loss of fuel mileage. I get well over 300 miles a tank with my modded WRX

what about the wires ? should i jsut do the plugs and then see if anything changes ?
vipergtrdj is offline   Reply With Quote
Old 01-26-2007, 08:44 PM   #19
Sir-Knight
Scooby Specialist
 
Member#: 73636
Join Date: Nov 2004
Chapter/Region: E. Canada
Location: the 'wa, ontario, canada
Vehicle:
2007 Impreza 2.5i SE
newport blue pearl

Default

how cold is it where you drive/live? I'm experiencing an average of 20-30% more consumption at -20 degrees C vs +10 degrees C. Cold weather might account for part of your crappy fuel equation. My car is only 3 months old, so nothing mentioned could possibly be affecting mileage that badly.
Sir-Knight is offline   Reply With Quote
Old 01-26-2007, 08:46 PM   #20
vipergtrdj
Scooby Newbie
 
Member#: 131770
Join Date: Nov 2006
Vehicle:
2001 Subaru Impreza
Silver

Default

i live in vermont ... and yes its a bit cold lol its about -20 at night and about 0 when i go to work and when im done with work.
vipergtrdj is offline   Reply With Quote
Old 02-15-2007, 12:44 AM   #21
misterjoshua
Scooby Specialist
 
Member#: 140599
Join Date: Feb 2007
Chapter/Region: NWIC
Location: Kennewick
Vehicle:
'05 WRX Stg2
WRB

Default

I just recently bought an '05 WRX and was shocked to see it get as bad of gas mileage as it does. I think I got over 21 mpg once or twice on some of my longer trips but average more in the 18-20 mpg range. I have got as low as 17 recently. It is winter time so I can only hope I can pull some better mileage when it warms up some. I guess I was just hoping for more in the mid-20s. The car only had 16K on it when I bought it so I doubt its any sort of mechanical issue. Turbo+AWD = gas guzzling it seems.
misterjoshua is offline   Reply With Quote
Old 02-15-2007, 10:52 AM   #22
Zeckel
Scooby Newbie
 
Member#: 52327
Join Date: Jan 2004
Location: Indianapolis
Vehicle:
2003 Impreza
Black

Default

These cars should not be getting such bad milage, unless driven hard and with many short trips (richer AFR when engine is cold). I have been tracking my milage (over a years worth of data) 2003 wrx Cobb stage 2 and have averaged 24.32 mpg with a 1.25 standard deviation.
Zeckel is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Azenis cause bad gas mileage ButtzWRX Tire & Wheel 12 07-01-2003 03:58 PM
Getting bad gas mileage! sub25rs Normally Aspirated Powertrain 8 01-22-2003 04:26 PM
Bad gas mileage on my 97 Leg. GT Why? georgiamiata Normally Aspirated Powertrain 5 07-01-2002 10:53 PM
Bad Gas Mileage Issue (Post answers here) bobafett Newbies & FAQs 10 04-03-2002 06:38 PM
Bad Gas Mileage...help. Skirvdawg General Forum Archive 22 03-22-2001 06:51 PM


All times are GMT -4. The time now is 06:18 PM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2014 Axivo Inc.
Copyright ©1999 - 2014, North American Subaru Impreza Owners Club, Inc.