# 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:** 1\ **Showing post:** 18
**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 --- _[View the full topic](https://forums.speedlife.net/t/my-mpgs-are-suckingggg-help/263445)._