Engine Management Cobb AccessPort, EcuTek, TEC, Motec, Link, and others. The ins and outs of high-performance engine tuning.

bad gas mileage

Thread Tools
 
Search this Thread
 
Old 10-26-2009, 02:27 AM
  #1  
Registered User
Thread Starter
iTrader: (1)
 
blackbullet03's Avatar
 
Join Date: Oct 2008
Location: San Jose, CA
Posts: 136
Car Info: Subaru WRX Impreza
bad gas mileage

hey guys, i'm currently pretty much stock on my 03 wrx. i have an SPT intake and stage 1 with the cobb access port. question is, i'm getting TERRIBLE gas mileage, and i don't know what i could be. I'm thinkin bad spark plugs?

blackbullet03 is offline  
Old 10-26-2009, 02:34 AM
  #2  
Registered User
iTrader: (30)
 
KrAzYkld's Avatar
 
Join Date: Mar 2008
Location: Dublin
Posts: 1,256
Car Info: 1998 M3, 2016 WRX
what's considered "bad"? specific mpg might help
KrAzYkld is offline  
Old 10-26-2009, 05:20 AM
  #3  
Registered User
iTrader: (5)
 
achavez's Avatar
 
Join Date: Oct 2007
Location: family sedan 05 caddy sts v8
Posts: 549
Car Info: sold: 06 wrx
dirty maf? dirty filter? exhaust leak? too much WOT? who knows
achavez is offline  
Old 10-26-2009, 07:33 AM
  #4  
Churro Aficionado
iTrader: (38)
 
stupidchicken03's Avatar
 
Join Date: Feb 2008
Location: IG - @thomas.teammoist
Posts: 54,632
Car Info: IG - @TEAMMOISTOFFICIAL
Its lead, and your foot

stupidchicken03 is offline  
Old 10-27-2009, 02:10 PM
  #5  
Registered User
iTrader: (2)
 
dogcatfud's Avatar
 
Join Date: May 2009
Location: Union City, CA
Posts: 203
Car Info: 2015 FR-S
Have you followed the recommended maintenance schedule? Do you drive the car hard? How do you define "terrible gas mileage"? We can't help unless you're more specific.
dogcatfud is offline  
Old 10-29-2009, 02:25 PM
  #6  
Registered User
Thread Starter
iTrader: (1)
 
blackbullet03's Avatar
 
Join Date: Oct 2008
Location: San Jose, CA
Posts: 136
Car Info: Subaru WRX Impreza
All good questions that that I didn't think about. I'm gonna do a small test and see how many miles to the gallon i'm getting. I'm "guessing" like 15 to the gallon or less. I'll put $20 and it'll be gone in 2 days. So i'll get back to everyone shortly.
blackbullet03 is offline  
Old 10-29-2009, 02:31 PM
  #7  
Registered User
Thread Starter
iTrader: (1)
 
blackbullet03's Avatar
 
Join Date: Oct 2008
Location: San Jose, CA
Posts: 136
Car Info: Subaru WRX Impreza
Originally Posted by stupidchicken03
Its lead, and your foot

dude thank you so much! I figured out that was the problem!
blackbullet03 is offline  
Old 10-29-2009, 03:08 PM
  #8  
Churro Aficionado
iTrader: (38)
 
stupidchicken03's Avatar
 
Join Date: Feb 2008
Location: IG - @thomas.teammoist
Posts: 54,632
Car Info: IG - @TEAMMOISTOFFICIAL
Originally Posted by blackbullet03
dude thank you so much! I figured out that was the problem!
and you put this in the "Engine Management" section why?
stupidchicken03 is offline  
Old 10-29-2009, 04:32 PM
  #9  
Registered User
Thread Starter
iTrader: (1)
 
blackbullet03's Avatar
 
Join Date: Oct 2008
Location: San Jose, CA
Posts: 136
Car Info: Subaru WRX Impreza
Originally Posted by stupidchicken03
and you put this in the "Engine Management" section why?
Then where else do i put it? Doesn't fuel have to do with the engine?

But what's done is done, don't get all butthurt that I put it in the "wrong" section. Seems like you're the only one that cares, everyone else is trying to help so thanks for your pointless effort. Good day.

blackbullet03 is offline  
Old 10-29-2009, 05:31 PM
  #10  
Registered User
iTrader: (6)
 
04caliwrx's Avatar
 
Join Date: Mar 2006
Location: on the way to lake tahoe to shread! turbo beast
Posts: 9,581
Car Info: 2016 WRX, 2014 lifter forester XT, 2005 JDM207 WGN
wow 15 is hella bad!! I have a full built engine with a 30r and I get like 17 avarage lol
04caliwrx is offline  
Old 10-29-2009, 05:48 PM
  #11  
Registered User
 
Redils16's Avatar
 
Join Date: Feb 2009
Location: Walnut Creek/Davis
Posts: 456
Car Info: '02 WRX
i'm pretty much stock just exhaust and intake and i get over 19 on average
Redils16 is offline  
Old 10-29-2009, 05:49 PM
  #12  
Registered User
 
Redils16's Avatar
 
Join Date: Feb 2009
Location: Walnut Creek/Davis
Posts: 456
Car Info: '02 WRX
^ and thats driving the proper way...not economically
Redils16 is offline  
Old 10-29-2009, 06:07 PM
  #13  
Registered User
iTrader: (2)
 
dogcatfud's Avatar
 
Join Date: May 2009
Location: Union City, CA
Posts: 203
Car Info: 2015 FR-S
Here is an accurate way to calculate gas mileage.

1. Go to your favorite gas station.
2. Pump gas, noting the notch that you selected for fuel delivery rate. Some pumps have two notches. Valero usually has three notches. Also, remember the pump you used.
3. Let it fill the tank completely and click off by itself. Don't add any more gas.
4. Reset your trip odometer to zero.
5. Drive the car in your normal style until the tank is near empty.
6. Go back to the same gas station and go back to the same pump.
7. Pump gas using the same notch (delivery rate) you selected before.
8. Let it fill the tank completely and click off by itself. Don't add any more gas.
9. Divide the mileage from your trip odometer by the number of gallons you pumped.
10. You now have your MPG.
dogcatfud is offline  
Old 10-30-2009, 12:03 AM
  #14  
Churro Aficionado
iTrader: (38)
 
stupidchicken03's Avatar
 
Join Date: Feb 2008
Location: IG - @thomas.teammoist
Posts: 54,632
Car Info: IG - @TEAMMOISTOFFICIAL
Originally Posted by blackbullet03
Then where else do i put it? Doesn't fuel have to do with the engine?

But what's done is done, don't get all butthurt that I put it in the "wrong" section. Seems like you're the only one that cares, everyone else is trying to help so thanks for your pointless effort. Good day.

calm down turbo
stupidchicken03 is offline  
Old 10-30-2009, 01:05 AM
  #15  
Registered User
iTrader: (3)
 
subi4justin's Avatar
 
Join Date: Apr 2007
Location: brentwood CA
Posts: 3,567
Car Info: 2015 SWP WRX
Originally Posted by dogcatfud
Here is an accurate way to calculate gas mileage.

1. Go to your favorite gas station.
2. Pump gas, noting the notch that you selected for fuel delivery rate. Some pumps have two notches. Valero usually has three notches. Also, remember the pump you used.
3. Let it fill the tank completely and click off by itself. Don't add any more gas.
4. Reset your trip odometer to zero.
5. Drive the car in your normal style until the tank is near empty.
6. Go back to the same gas station and go back to the same pump.
7. Pump gas using the same notch (delivery rate) you selected before.
8. Let it fill the tank completely and click off by itself. Don't add any more gas.
9. Divide the mileage from your trip odometer by the number of gallons you pumped.
10. You now have your MPG.
Do this and let us know exactly what you are getting.


I know that when I was getting really bad gas mileage it was because my front o2 sensor was going bad, that might be it and that might not be it too. If you feel its your spark plugs, then change them. Maybe check you air filter as well and give that a good clean up. But it could also be that you have a heavy right foot. There are a lot of factors to choice from.

Also check you PSI in your tires, thats gotten me bad MPG as well. Hope that helps
subi4justin is offline  


Quick Reply: bad gas mileage



All times are GMT -7. The time now is 11:59 PM.