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Old 04-14-2013, 07:30 PM   #1
pbrules10
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Default Terrible mpgs

I have a 2007 wrx with Cobb stage 2 tune, perrin catted dp and Megan cb exhaust. Even when trying I can usually only get 200 miles or so out of a full tank. What the hell is going on here? I assume it's running rich because my friend says when I get on it I blow black smoke everywhere. What can I do about this?
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Old 04-14-2013, 07:33 PM   #2
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Besides checking the obvious (proper tire inflation, etc) I'd look at your tune. Black smoke out of the exhaust typically means your car is getting more gas than it can use.
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Old 04-14-2013, 09:47 PM   #3
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Sounds pretty low. You should definitely start logging mpg so you have actual numbers to help you on resolving the problem.
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Old 04-14-2013, 10:34 PM   #4
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I know this is not the cause due to black smoke. But I just cleaned my maf, throttle body, and ran seafoam picked up alot of lost power and mpgs!
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Old 04-14-2013, 10:39 PM   #5
pbrules10
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Sounds pretty low. You should definitely start logging mpg so you have actual numbers to help you on resolving the problem.
Well if you figure the fuel tank holds approximately 15.9 gallons and on a good fill I get 220 miles out if it (220/15.9) that's about 14 mpgs. Most of the time I get like 200 miles out of the tank so even less then 14 mpgs.
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Old 04-14-2013, 10:41 PM   #6
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Originally Posted by Monsterkx2fiddy View Post
I know this is not the cause due to black smoke. But I just cleaned my maf, throttle body, and ran seafoam picked up alot of lost power and mpgs!
I seafoamed it 2 months ago. No change really.
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Old 04-14-2013, 10:45 PM   #7
pbrules10
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Originally Posted by Brent22 View Post
Besides checking the obvious (proper tire inflation, etc) I'd look at your tune. Black smoke out of the exhaust typically means your car is getting more gas than it can use.
How can I look at the tune? It's the stage 2 ots map from cobb.
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Old 04-14-2013, 11:15 PM   #8
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Originally Posted by pbrules10 View Post

How can I look at the tune? It's the stage 2 ots map from cobb.
U r using a an ots map, get protuned!!!!
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Old 04-14-2013, 11:25 PM   #9
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I plan on getting a protune soon but as of right now I'd still expect better then 14 mpgs! haha
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Old 04-15-2013, 10:45 AM   #10
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Quote:
Originally Posted by trev762 View Post
U r using a an ots map, get protuned!!!!
I'm using an OTS map, and I don't get 14MPG, I get ~22.

Quote:
Originally Posted by pbrules10 View Post
I plan on getting a protune soon but as of right now I'd still expect better then 14 mpgs! haha
When is the last time you updated the accessport? I'm pretty new to it, but don't they release new maps for the OTS stuff too? You might try and get an updated map and see if that helps.

Otherwise I would start logging and see what exactly is going on. You may be able to contact COBB and tell them what's happening and they might lend some advice as well.

Still, the Protune would be the best option since a tuner can really see what is going on with your car and correct the issue, unless it's mechanical.
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Old 04-15-2013, 10:54 AM   #11
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13 STG II STi. I avg about 14-16mpg per tank.

You must drive like a complete grandma to get ~22mpg. I'm not on the car all the time but I do drive "spiritedly". It's kind of why I bought the thing, not for the great fuel economy.

If I cruse on the highway at 70mph with the cruise on I guess I'll get somewhere around 22mpg. As soon as I exit it drops
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Old 04-15-2013, 11:14 AM   #12
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13 STG II STi. I avg about 14-16mpg per tank.

You must drive like a complete grandma to get ~22mpg. I'm not on the car all the time but I do drive "spiritedly". It's kind of why I bought the thing, not for the great fuel economy.

If I cruse on the highway at 70mph with the cruise on I guess I'll get somewhere around 22mpg. As soon as I exit it drops
There's times where I pretty much drive like hell for the the whole tank and times where I drive like a grandma the whole tank. No matter which one it is I still get the same MPG.
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Old 04-15-2013, 11:15 AM   #13
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Originally Posted by Jaredwhamilton View Post

I'm using an OTS map, and I don't get 14MPG, I get ~22.

When is the last time you updated the accessport? I'm pretty new to it, but don't they release new maps for the OTS stuff too? You might try and get an updated map and see if that helps.

Otherwise I would start logging and see what exactly is going on. You may be able to contact COBB and tell them what's happening and they might lend some advice as well.

Still, the Protune would be the best option since a tuner can really see what is going on with your car and correct the issue, unless it's mechanical.
When I bought the car the previous owner gave me the AP with it. I don't know when it was updated but how do I go about doing that?
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Old 04-15-2013, 11:34 AM   #14
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Quote:
Originally Posted by Jaredwhamilton View Post

I'm using an OTS map, and I don't get 14MPG, I get ~22.

When is the last time you updated the accessport? I'm pretty new to it, but don't they release new maps for the OTS stuff too? You might try and get an updated map and see if that helps.

Otherwise I would start logging and see what exactly is going on. You may be able to contact COBB and tell them what's happening and they might lend some advice as well.

Still, the Protune would be the best option since a tuner can really see what is going on with your car and correct the issue, unless it's mechanical.
In short words is exactly why I said get protuned and doesn't matter if u r getting 22mpg as appose to 14mpg every car isn't going to get the same results this is why I said to get protuned lol.
An Accessport update isn't going to do anything for him/

Not a fan of ots maps as I was reading way to lean and some r running way to rich/


By getting a protune done this way the tuner can see exactly his air/fuel ratio is with a wideband o2, unless the op has a wideband already which I highly doubt.

Last edited by trev762; 04-15-2013 at 11:53 AM.
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Old 04-15-2013, 11:38 AM   #15
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Originally Posted by pbrules10 View Post
When I bought the car the previous owner gave me the AP with it. I don't know when it was updated but how do I go about doing that?
Download the accessport manager from here, install it and plug in your accessport to your computer. This is all assuming you have the 3 button, color display AP.....
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Old 04-15-2013, 11:41 AM   #16
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Quote:
Originally Posted by pbrules10 View Post
I have a 2007 wrx with Cobb stage 2 tune, perrin catted dp and Megan cb exhaust. Even when trying I can usually only get 200 miles or so out of a full tank. What the hell is going on here? I assume it's running rich because my friend says when I get on it I blow black smoke everywhere. What can I do about this?
Pull out your AP and start making some logs. Start with the closed loop fueling compensations, AFR, DAM, feedback and fine learning knock correction. If I had to guess I'd say your front O2 has gone kaput.


Quote:
Originally Posted by ALOKIN View Post
13 STG II STi. I avg about 14-16mpg per tank.

You must drive like a complete grandma to get ~22mpg. I'm not on the car all the time but I do drive "spiritedly". It's kind of why I bought the thing, not for the great fuel economy.

If I cruse on the highway at 70mph with the cruise on I guess I'll get somewhere around 22mpg. As soon as I exit it drops
It sounds like there's something wrong with your car. 14 is the kind of mileage you should be getting on a track day, not while driving on the street, and 22 on the highway is pathetic. I get a pretty consistent 21. If I'm driving very hard the whole tank, it will be closer to 20. If I'm grannying it it will be closer to 22. If I'm cruising on the freeway it's closer to 28.
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Old 04-15-2013, 11:46 AM   #17
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Quote:
It sounds like there's something wrong with your car. 14 is the kind of mileage you should be getting on a track day, not while driving on the street, and 22 on the highway is pretty pathetic. I get a pretty consistent 21. If I'm driving very hard the whole tank, it will be closer to 20. If I'm grannying it it will be closer to 22. If I'm cruising on the freeway it's closer to 28.
This is exactly what i see on mine. Stg. 2 ots 93+ intake map.
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Old 04-15-2013, 11:57 AM   #18
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Originally Posted by the suicidal eggroll View Post
Pull out your AP and start making some logs. Start with the closed loop fueling compensations, AFR, DAM, feedback and fine learning knock correction. If I had to guess I'd say your front O2 has gone kaput.

It sounds like there's something wrong with your car. 14 is the kind of mileage you should be getting on a track day, not while driving on the street, and 22 on the highway is pathetic. I get a pretty consistent 21. If I'm driving very hard the whole tank, it will be closer to 20. If I'm grannying it it will be closer to 22. If I'm cruising on the freeway it's closer to 28.
Exactly what I get on my11 sti stg2 protuned 20-21mpg city and 28mpg hwy.
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Old 04-15-2013, 12:09 PM   #19
pbrules10
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Holy crap, just figured out all this plugging in and updating stuff lol. I wasn't aware of this. I just updated my ap and will hopefully be data logging soon.
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Old 04-15-2013, 01:11 PM   #20
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Originally Posted by the suicidal eggroll View Post
Pull out your AP and start making some logs. Start with the closed loop fueling compensations, AFR, DAM, feedback and fine learning knock correction. If I had to guess I'd say your front O2 has gone kaput.



It sounds like there's something wrong with your car. 14 is the kind of mileage you should be getting on a track day, not while driving on the street, and 22 on the highway is pathetic. I get a pretty consistent 21. If I'm driving very hard the whole tank, it will be closer to 20. If I'm grannying it it will be closer to 22. If I'm cruising on the freeway it's closer to 28.
Highly doubtful there is anything wrong with my brand new STi. A more likely scenario are people inflating their MPGs or over estimating on the high side so they feel good. I tend to underestimate everything. I don't daily drive my STi, so when I do I am on it and could care less if I get 10mpg really.
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Old 04-15-2013, 02:07 PM   #21
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when is the last time you changed your plugs?
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Old 04-15-2013, 02:08 PM   #22
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Highly doubtful there is anything wrong with my brand new STi.
Maybe, maybe not. You already have the AP, so why not do some logs? I already posted above what should be logged for the OP, and you're in the same boat. It could be something as simple as a boost leak, but you won't know until you look into it. It's not just about mileage either. Whatever is causing your low mpg could also be damaging the engine or robbing you of a lot of power.

Quote:
Originally Posted by ALOKIN View Post
A more likely scenario are people inflating their MPGs or over estimating on the high side so they feel good.
In ~8000 miles, I have never got below 19.5 mpg on a tank on my WRX, and I calculate my mileage every time I fill up. That includes driving in the snow, start ups at 0 F with long warm up times, and tanks with pretty aggressive driving and lots of boost. What's more likely, that everybody, including Subaru, is inflating their mpg numbers by about 50%, or that your car is not running correctly?

Last edited by the suicidal eggroll; 04-15-2013 at 02:15 PM.
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Old 04-15-2013, 02:29 PM   #23
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Originally Posted by ALOKIN View Post

Highly doubtful there is anything wrong with my brand new STi. A more likely scenario are people inflating their MPGs or over estimating on the high side so they feel good. I tend to underestimate everything. I don't daily drive my STi, so when I do I am on it and could care less if I get 10mpg really.
Anything can go wrong at anytime, certainly when new, otherwise we wouldn't need warranties. An o2 sensor is constantly under extreme heat, and though they were designed to handle this stress, it is stress none the less. Just something to consider is all he's saying. We are not overestimating milage as there is a whole thread with thousands of posts that says the same as us, 14 mpg says something's wrong. Might not be the car either, could be the driver. Hard, constant WOT city driving, and by city i mean a light every block, and only this type of driving, with absolutely no other type of driving for a tank would produce 14 MPG. Since you said you are on it, and its not a dd so i assume by get on it you mean get on it, 14 sounds perfectly reasonable to me.

Just for fun, a stock evo set the record for worst mpg on top gear's track, 2.4 mpg.....

Last edited by Cathexis; 04-15-2013 at 02:35 PM.
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Old 04-15-2013, 02:54 PM   #24
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Originally Posted by the suicidal eggroll View Post
Pull out your AP and start making some logs. Start with the closed loop fueling compensations, AFR, DAM, feedback and fine learning knock correction. If I had to guess I'd say your front O2 has gone kaput.

It sounds like there's something wrong with your car. 14 is the kind of mileage you should be getting on a track day, not while driving on the street, and 22 on the highway is pathetic. I get a pretty consistent 21. If I'm driving very hard the whole tank, it will be closer to 20. If I'm grannying it it will be closer to 22. If I'm cruising on the freeway it's closer to 28.
Ok I'm on the AP which af am i monitoring? Af correction 1 af correction 3 or one of the af learning?
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Old 04-15-2013, 03:01 PM   #25
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Ok I'm on the AP which af am i monitoring? Af correction 1 af correction 3 or one of the af learning?
Correction 1 and Learning. If you can't find the field for the current active AF Learning, then just grab A-D.
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