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bad gas mileage

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Old Oct 26, 2009 | 02:27 AM
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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?

Old Oct 26, 2009 | 02:34 AM
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what's considered "bad"? specific mpg might help
Old Oct 26, 2009 | 05:20 AM
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dirty maf? dirty filter? exhaust leak? too much WOT? who knows
Old Oct 26, 2009 | 07:33 AM
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Its lead, and your foot

Old Oct 27, 2009 | 02:10 PM
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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.
Old Oct 29, 2009 | 02:25 PM
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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.
Old Oct 29, 2009 | 02:31 PM
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Originally Posted by stupidchicken03
Its lead, and your foot

dude thank you so much! I figured out that was the problem!
Old Oct 29, 2009 | 03:08 PM
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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?
Old Oct 29, 2009 | 04:32 PM
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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.

Old Oct 29, 2009 | 05:31 PM
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wow 15 is hella bad!! I have a full built engine with a 30r and I get like 17 avarage lol
Old Oct 29, 2009 | 05:48 PM
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i'm pretty much stock just exhaust and intake and i get over 19 on average
Old Oct 29, 2009 | 05:49 PM
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^ and thats driving the proper way...not economically
Old Oct 29, 2009 | 06:07 PM
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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.
Old Oct 30, 2009 | 12:03 AM
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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
Old Oct 30, 2009 | 01:05 AM
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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



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