# My mpgs are suckingggg help! **URL:** \ **Category:** Shift518 Automotive\ **Created:** [April 18, 2012, 8:49am UTC](https://forums.speedlife.net/t/my-mpgs-are-suckingggg-help/263445 "2012-04-18T08:49:02Z")\ **Posts on this page:** 20\ **Page:** 1
**Author:** ![02rallyblue](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/02rallyblue/32/6756_2.png) [@02rallyblue](https://forums.speedlife.net/u/02rallyblue)\ **Post date:** [April 18, 2012, 8:49am UTC](https://forums.speedlife.net/t/my-mpgs-are-suckingggg-help/263445/1 "2012-04-18T08:49:02Z")
My 02 wrx is getting about 12 mpg. I know that I don’t have a rear cat. But the plugs have been replaced and still nothing. Ecu soft reset has also been done. Nothing. Any ideas?! ---
**Author:** ![K20power](https://avatars.discourse-cdn.com/v4/letter/k/41988e/32.png) [@K20power](https://forums.speedlife.net/u/K20power)\ **Post date:** [April 18, 2012, 8:54am UTC](https://forums.speedlife.net/t/my-mpgs-are-suckingggg-help/263445/2 "2012-04-18T08:54:33Z")
It’s a Subaru. Probably gonna blow up soon. ---
**Author:** ![adamea1635](https://avatars.discourse-cdn.com/v4/letter/a/bc8723/32.png) [@adamea1635](https://forums.speedlife.net/u/adamea1635)\ **Post date:** [April 18, 2012, 8:56am UTC](https://forums.speedlife.net/t/my-mpgs-are-suckingggg-help/263445/3 "2012-04-18T08:56:01Z")
Any noticeable reductions in power? And at what RPM range with what sort of throttle? I think that would give a little more information for educated guesses. ---
**Author:** ![RocketPunch](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/rocketpunch/32/6429_2.png) [@RocketPunch](https://forums.speedlife.net/u/RocketPunch)\ **Post date:** [April 18, 2012, 9:00am UTC](https://forums.speedlife.net/t/my-mpgs-are-suckingggg-help/263445/4 "2012-04-18T09:00:05Z")
So, if you coast 1/2 of the time, you will get 24mpg out of it. Problem? ---
**Author:** ![usmc2801](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/usmc2801/32/6387_2.png) [@usmc2801](https://forums.speedlife.net/u/usmc2801)\ **Post date:** [April 18, 2012, 9:16am UTC](https://forums.speedlife.net/t/my-mpgs-are-suckingggg-help/263445/5 "2012-04-18T09:16:00Z")
[http://shift518.com/showthread.php?p=957726#post957726](http://shift518.com/showthread.php?p=957726#post957726) ^ answer to your problems LOL But seriously, do you have a check engine light on? If not you could still have a faulty O2 sensor causing you poor MPG’s. ---
**Author:** ![underboosted](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/underboosted/32/6424_2.png) [@underboosted](https://forums.speedlife.net/u/underboosted)\ **Post date:** [April 18, 2012, 9:23am UTC](https://forums.speedlife.net/t/my-mpgs-are-suckingggg-help/263445/6 "2012-04-18T09:23:35Z")
Air filter clogged up? ---
**Author:** ![Progress](https://avatars.discourse-cdn.com/v4/letter/p/ccd318/32.png) [@Progress](https://forums.speedlife.net/u/Progress)\ **Post date:** [April 18, 2012, 9:25am UTC](https://forums.speedlife.net/t/my-mpgs-are-suckingggg-help/263445/7 "2012-04-18T09:25:03Z")
Change your o2 sensors ---
**Author:** ![RTrac1](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/rtrac1/32/6312_2.png) [@RTrac1](https://forums.speedlife.net/u/RTrac1)\ **Post date:** [April 18, 2012, 9:39am UTC](https://forums.speedlife.net/t/my-mpgs-are-suckingggg-help/263445/8 "2012-04-18T09:39:52Z")
fuel leak? ---
**Author:** ![usmc2801](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/usmc2801/32/6387_2.png) [@usmc2801](https://forums.speedlife.net/u/usmc2801)\ **Post date:** [April 18, 2012, 9:44am UTC](https://forums.speedlife.net/t/my-mpgs-are-suckingggg-help/263445/9 "2012-04-18T09:44:51Z")
> [@Police Checkpoint: 5/29](https://forums.speedlife.net/t/police-checkpoint-5-29/49208/7): > > Air filter clogged up? Didnt think of that good call, check this first. > [@Police Checkpoint: 5/29](https://forums.speedlife.net/t/police-checkpoint-5-29/49208/8): > > Change your o2 sensors Do not change both, change the front one and see if there is any change, if not consider checking the rear one, but I would def check the air filter first…the rear o2 can affect the AFR but its mainly for the catalytic converters performance. ---
**Author:** ![ninety1two40](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/ninety1two40/32/6332_2.png) [@ninety1two40](https://forums.speedlife.net/u/ninety1two40)\ **Post date:** [April 18, 2012, 9:45am UTC](https://forums.speedlife.net/t/my-mpgs-are-suckingggg-help/263445/10 "2012-04-18T09:45:22Z")
Wow that’s shitty, thank a cigrit I dont have a Subaru :lol ---
**Author:** ![02rallyblue](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/02rallyblue/32/6756_2.png) [@02rallyblue](https://forums.speedlife.net/u/02rallyblue)\ **Post date:** [April 18, 2012, 9:51am UTC](https://forums.speedlife.net/t/my-mpgs-are-suckingggg-help/263445/11 "2012-04-18T09:51:59Z")
Check eng is on for cat and 02, I’ll have CRC help with the filter. But I believe the 02 in the culprit ---
**Author:** ![LKSi](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/lksi/32/6316_2.png) [@LKSi](https://forums.speedlife.net/u/LKSi)\ **Post date:** [April 18, 2012, 9:57am UTC](https://forums.speedlife.net/t/my-mpgs-are-suckingggg-help/263445/12 "2012-04-18T09:57:15Z")
that would have been important to mention ---
**Author:** ![usmc2801](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/usmc2801/32/6387_2.png) [@usmc2801](https://forums.speedlife.net/u/usmc2801)\ **Post date:** [April 18, 2012, 10:00am UTC](https://forums.speedlife.net/t/my-mpgs-are-suckingggg-help/263445/13 "2012-04-18T10:00:32Z")
> [@FS: 18" ASA AR1's](https://forums.speedlife.net/t/fs-18-asa-ar1s/49202/4): > > Check eng is on for cat and 02, I’ll have CRC help with the filter. But I believe the 02 in the culprit Well then you answered your own question LOL Since you have codes for both the o2 and cat change both o2 sensors. ---
**Author:** ![91teg](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/91teg/32/6304_2.png) [@91teg](https://forums.speedlife.net/u/91teg)\ **Post date:** [April 18, 2012, 10:23am UTC](https://forums.speedlife.net/t/my-mpgs-are-suckingggg-help/263445/14 "2012-04-18T10:23:24Z")
Women :lol ---
**Author:** ![02rallyblue](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/02rallyblue/32/6756_2.png) [@02rallyblue](https://forums.speedlife.net/u/02rallyblue)\ **Post date:** [April 18, 2012, 10:48am UTC](https://forums.speedlife.net/t/my-mpgs-are-suckingggg-help/263445/15 "2012-04-18T10:48:16Z")
Hey listen, gentlemen obviously my light is on if I don’t have a rear cat, which was previously mentioned 🙂 ---
**Author:** ![02rallyblue](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/02rallyblue/32/6756_2.png) [@02rallyblue](https://forums.speedlife.net/u/02rallyblue)\ **Post date:** [April 18, 2012, 10:49am UTC](https://forums.speedlife.net/t/my-mpgs-are-suckingggg-help/263445/16 "2012-04-18T10:49:16Z")
I’m asking because some have told me that I should change the 02 and some say just get a tune. I was only looking for other opinions. Thanks to you that answered 🙂 ---
**Author:** ![d\_gage](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/d_gage/32/6321_2.png) [@d\_gage](https://forums.speedlife.net/u/d_gage)\ **Post date:** [April 18, 2012, 10:50am UTC](https://forums.speedlife.net/t/my-mpgs-are-suckingggg-help/263445/17 "2012-04-18T10:50:42Z")
as long as your stove doesn’t have a CEL, who gives a fuck??? ---
**Author:** ![KrazyKid](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/krazykid/32/6371_2.png) [@KrazyKid](https://forums.speedlife.net/u/KrazyKid)\ **Post date:** [April 18, 2012, 11:00am UTC](https://forums.speedlife.net/t/my-mpgs-are-suckingggg-help/263445/18 "2012-04-18T11:00:31Z")
> [@Police Checkpoint: 5/29](https://forums.speedlife.net/t/police-checkpoint-5-29/49208/13): > > as long as your stove doesn’t have a CEL, who gives a fuck??? LOL, Amanda, welcome to Shift! hahah > [@Official: NHL Playoff Thread](https://forums.speedlife.net/t/official-nhl-playoff-thread/46500/606): > > Hey listen, gentlemen obviously my light is on if I don’t have a rear cat, which was previously mentioned 🙂 HAHA gottum! Wonder how the ECU compensates for catalytic inefficiency codes, becasue the cat isnt there? I am no subaru tooner so i am not sure if it trys to compensate for it somehow. upstream o2 I say we try first… since thats the one that does the most work really. We can also pull MAF readings for G/sec and see if its where it should be for in coming air flow. If the filter is clogged to crap, they should read low. Take a log with it as is. Remove the air filter and take it for a quick pull again and compare the logs from the MAF. If they are close, I doubt the air filter has anything to do with it. Also the thing will adapt itself out of all but a 100% clogged air filter. There will be a loss in power from detuning itself, but the ecu’s are smart enough to not keep pumping in a consistent amount of fuel, when the incoming air isnt getting in along side it. I know there is a block on the VW’s that shows the +/- up to 15% addaptive fueling. Meaning if that block says +12% lets say, its running somehow lean enough to call for %15 higher fuel trim. if its -12% its running too rich and trying to remove fuel trim. I assume the subaru is the same deal… just not familiar with the software myself. Paging BOXERSICKS ---
**Author:** ![underboosted](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/underboosted/32/6424_2.png) [@underboosted](https://forums.speedlife.net/u/underboosted)\ **Post date:** [April 18, 2012, 11:03am UTC](https://forums.speedlife.net/t/my-mpgs-are-suckingggg-help/263445/19 "2012-04-18T11:03:02Z")
And I also said air filter because she didn’t say the check engine light was on. ---
**Author:** ![Cossey](https://avatars.discourse-cdn.com/v4/letter/c/3ec8ea/32.png) [@Cossey](https://forums.speedlife.net/u/Cossey)\ **Post date:** [April 18, 2012, 11:03am UTC](https://forums.speedlife.net/t/my-mpgs-are-suckingggg-help/263445/20 "2012-04-18T11:03:53Z")
If she can get it tuned with an ECU reflash, the tuner should be able to make it so her CEL is no longer on. At least any competent Subaru tuner should be able to. I recommend EFI Logics in CT. Sandwich for payment or my help would be accepted. [Next page](https://forums.speedlife.net/t/my-mpgs-are-suckingggg-help/263445.md?page=2)