DrD123 Posted May 19, 2017 Share Posted May 19, 2017 So I am at about 45k miles and the past few tanks, my fuel economy has dropped a tad (maybe 5% or so) - figured it was likely the plugs, so I have a set of NGK SILFR6B8 on the way and I'll install them either tomorrow or Sunday. Service manual calls for 60k, but a little early sounds about right for the GT. Curious what others have done. Link to comment Share on other sites More sharing options...
dgoodhue Posted May 19, 2017 Share Posted May 19, 2017 The gas mileage in my 2.5i has slipped a little bit in the last year. I had adjusted my cluster mpg display and my calculate fill ups used to always be within +/- .1 or .2 or the cluster read out if not dead on. In the last year it has shifter and its now 0.5-0.8mph optimistic. It has 76K miles on it and I did the plugs at 60k (along with the fuel filter). I am kind of thinking maybe my O2 sensor is aging and that is account for my slight change in fuel efficiency. The overall mpg also seem a little lower as well, I track my fuel economy every fill up on fuelly app. Link to comment Share on other sites More sharing options...
jojorios Posted May 19, 2017 Share Posted May 19, 2017 I did the plugs the first time I went stg2 which was at about 40k and then I just recently changed them again at 81k with all my other work. Switched to one step colder. The cost is so low that I will probably change them out every 40-50k miles. Link to comment Share on other sites More sharing options...
DrD123 Posted May 19, 2017 Author Share Posted May 19, 2017 I had adjusted my cluster mpg display and my calculate fill ups used to always be within +/- .1 or .2 or the cluster read out if not dead on. In the last year it has shifter and its now 0.5-0.8mph optimistic.I'm not sure what the car uses to determine the mpg in the display. On average (over the past 112 tanks...) mine is optimistic by 5% or so (with an SD of 0.4%) - I get enough scatter because my calculated is based upon what the pump puts in that I figure 5% is about right. I haven't noticed any change in the delta between what I calculate and what the mpg display gives me (I've been too lazy to adjust it - it's consistent, so that's been good for me) - the 5% (about 1mpg) drop I have seen the past few tanks is similar for both the display and what I calculate. if the plugs don't change it, maybe I'll try the fuel filter, too (was going to wait for that until I did the timing belt, etc. - opening the fuel tank is annoying... I liked the engine compartment located filter in my old 02 WRX...) Link to comment Share on other sites More sharing options...
FLlegacy Posted May 19, 2017 Share Posted May 19, 2017 The MPG gauge is like a dyno its really good for measuring changes in economy but it's not really accurate for figuring your exact mileage per gallon. Link to comment Share on other sites More sharing options...
islandborn Posted May 22, 2017 Share Posted May 22, 2017 Changed the plugs everytime I have to pull the engine out... Link to comment Share on other sites More sharing options...
GTEASER Posted May 22, 2017 Share Posted May 22, 2017 I'm at 53k and been at Stage1 since 29k. I plan to change them at 60k unless I go Stage2 before then, and they will be changed with the Stage2 mods. GTEASER's 2012 Legacy GT - Sold GTEASER's 2009 XTeaser - Sold GTEASER's 1992 Legacy SS - Sold Link to comment Share on other sites More sharing options...
s2baru Posted May 23, 2017 Share Posted May 23, 2017 You're required to get a new engine before changing the plugs. Link to comment Share on other sites More sharing options...
eckseleven Posted May 23, 2017 Share Posted May 23, 2017 I'm at 45k and have been tuned since 10k. Car is on the third set of plugs and forth set is going in this week... The former tuner recommended changing them roughly every year depending on how much it gets driven. I'm sure most will say that is way to often (I kinda lean that way too) but it's just how it has been done and I'll probably keep up with it. I figure it is cheap insurance. Link to comment Share on other sites More sharing options...
FLlegacy Posted May 23, 2017 Share Posted May 23, 2017 You're required to get a new engine before changing the plugs. I guess s2 has just been in the middle of a plug change for a while now... Sent from my SAMSUNG-SM-G920A using Tapatalk Link to comment Share on other sites More sharing options...
islandborn Posted May 23, 2017 Share Posted May 23, 2017 I guess s2 has just been in the middle of a plug change for a while now... Yup... He's reeeeeeeaaaaaaaalllllllly particular. Half turn a day I think is his present speed... Link to comment Share on other sites More sharing options...
Humble Rumble Posted May 23, 2017 Share Posted May 23, 2017 He only works on the equinoxes. 2012 Legacy 3.6R Build Thread 5th Gen Legacy BM/BR Body Kit Compendium Thread Link to comment Share on other sites More sharing options...
GTEASER Posted May 23, 2017 Share Posted May 23, 2017 Wouldn't it be Equinii? GTEASER's 2012 Legacy GT - Sold GTEASER's 2009 XTeaser - Sold GTEASER's 1992 Legacy SS - Sold Link to comment Share on other sites More sharing options...
FLlegacy Posted May 23, 2017 Share Posted May 23, 2017 Wouldn't it be Equinii? Link to comment Share on other sites More sharing options...
Humble Rumble Posted May 23, 2017 Share Posted May 23, 2017 Actually wasn't sure, so I looked it up. Logic would normally say so, but apparently in this situation "equinoxes" is correct. Who knew? https://en.wiktionary.org/wiki/equinoxes#English 2012 Legacy 3.6R Build Thread 5th Gen Legacy BM/BR Body Kit Compendium Thread Link to comment Share on other sites More sharing options...
s2baru Posted May 23, 2017 Share Posted May 23, 2017 Yup... He's reeeeeeeaaaaaaaalllllllly particular. Half turn a day I think is his present speed... Still looking for a wrench Link to comment Share on other sites More sharing options...
dgoodhue Posted May 23, 2017 Share Posted May 23, 2017 Still looking for a wrench What wrench do you need? Link to comment Share on other sites More sharing options...
islandborn Posted May 23, 2017 Share Posted May 23, 2017 Still looking for a wrench You mean wench??? Link to comment Share on other sites More sharing options...
s2baru Posted May 23, 2017 Share Posted May 23, 2017 What wrench do you need? One that isn't made of glass Link to comment Share on other sites More sharing options...
dgoodhue Posted May 24, 2017 Share Posted May 24, 2017 One that isn't made of glass I think you need a motivational wrench or perhap a motivational wench to fix your GT. Link to comment Share on other sites More sharing options...
islandborn Posted May 24, 2017 Share Posted May 24, 2017 Stu, I'd drive the 1800 miles in my ride just to motivate you! Link to comment Share on other sites More sharing options...
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