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Old 12-24-2012, 10:54 AM   #1
paN1k
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Default Poor Gas Milage

Hey all.. picked up my 2006 WRX about 2 weeks ago. I changed the spark plugs as they were past due, new air filter. I'm seeing about ~13-15MPG. Do you think it's OXS replacement time? Stock turbo, stock DP. I have been hitting the boost a bit hard sometimes, but not for a lengthy amount. Was expecting about 17-19MPG. Thinking of sea foaming it also.

I also noticed on idle, it's a bit lumpy, i get the usual boxer shakes, but after about 4-5 minutes I was facing uphill and the idle bounced a bit for a few secs. My compression check was OK and leakdown OK.
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Last edited by paN1k; 12-24-2012 at 11:01 AM.
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Old 12-24-2012, 11:28 AM   #2
HinshawWRX
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Over the course of how many tanks did you calculate? This could be the biggest issye.
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Old 12-24-2012, 11:37 AM   #3
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how is your driving style, when I first got my STI all I could do is BOOOOOOOST!!! resulting in a average mpg that laughable at best
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Old 12-24-2012, 11:46 AM   #4
paN1k
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Well, i'm getting around 200-220 per tank. Divide that by 15..
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Old 12-24-2012, 12:11 PM   #5
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Quote:
Originally Posted by paN1k View Post
Well, i'm getting around 200-220 per tank. Divide that by 15..


This is your problem. You're most likely getting at least 17-18.

Your tank is 15.9 first off. Number two, you don't run your tank down to zero... or anywhere even near that amount. When on E, you can have even 2-3 gallons left.

What you need to do is fill the car up fully at one particular pump. Set your triptometer to zero. Drive for at least 70-100 miles. Come back and fill up at that pump. Divide the exact miles driven by the exact amount of fuel put in.

I notice when I hit about 200-220, I'm lower than 1/4 on the gas gauge... hence I fill up. I usually end up putting 10-11 gallons in at this point.
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Old 12-24-2012, 01:04 PM   #6
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How many miles are on the car? Changing the oxygen sensors might be worth it if you have say >100k and you're not getting a good signal. You'll typically get a fault code when this happens though.

As others have said you really need to divide the miles by the number of gallons when you fill the car up. It's also more accurate to do a full tank.
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Old 12-24-2012, 01:11 PM   #7
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I cant bleive peopel still eyeball their mpg.

Fill tank all the way up till it clicks.

Reset ODO

Drive

Fill up till clicks again

Divide miles by what you jsut put in.

Then get back to us.
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Old 12-24-2012, 03:08 PM   #8
paN1k
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I did do a fillup. It's got 75k on it. I'll do a few more tanks and watch the boost.. I know the car isn't efficient on gas but I should be getting better than 13MPG on a stock tune with a TD04
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Old 12-24-2012, 03:33 PM   #9
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Quote:
Originally Posted by paN1k View Post
I did do a fillup. It's got 75k on it. I'll do a few more tanks and watch the boost.. I know the car isn't efficient on gas but I should be getting better than 13MPG on a stock tune with a TD04

Actually, you'd be surprised how much a bigger turbo can help the fuel economy. For example, my DSM on the stock TD04 13g got roughly 15ish mpg. I swapped that turbo for an evo 3 16g, and my MPG went to 20. The smaller turbo spooled so early that sometimes I'd get into boost without even realizing it, thus hurting my gas mileage.
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Old 12-24-2012, 03:44 PM   #10
paN1k
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Interesting.. thanks for the insight, I can see that as a possibility!
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Old 12-24-2012, 04:55 PM   #11
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Quote:
Originally Posted by paN1k View Post
I did do a fillup. It's got 75k on it. I'll do a few more tanks and watch the boost.. I know the car isn't efficient on gas but I should be getting better than 13MPG on a stock tune with a TD04
Then i dont understand why your spread is 13-15. Its a significant difference...its either 13 or 15. Calculations are too straight forward to have to ballpark it. How many miles did you get out of a tank and how many galons did you fill up?
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Old 12-24-2012, 05:08 PM   #12
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1. If you really have new spark plugs and new air filter. you'll get like 25mpg


2. If you city drive. you'll get like 15-20mpg.



3. If you're in boost at all... you'll get less.


The weight of the car makes a difference.... toss out all your wifes stuff.. make it lighter.
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Old 12-24-2012, 05:39 PM   #13
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Quote:
Originally Posted by al_s14 View Post
its either 13 or 15
Math is funny like that. It's exact. The ballpark you're making up clearly isn't coming from what people are telling you to do.
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Old 12-27-2012, 10:46 PM   #14
paN1k
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I got 23MPG on my last trip, mostly freeway. Not to shabby. I keep the car empty, just the necessities. I did notice it boosts a lot quicker then my previous VF52, which is probably the culprit of my MPG.
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Old 12-27-2012, 11:03 PM   #15
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i cant get less than 21-22mpg....even on the highway at 90mph with the ac on and a FULL LOAD in the car

06 wrx....td04 tbe and tuned
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Old 12-28-2012, 12:01 AM   #16
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I got 17 out of mine before I tuned it. Now I get 26 onthe highway.
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Old 12-28-2012, 12:02 AM   #17
Coreycarlile911
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Quote:
Originally Posted by Uncle Scotty View Post
i cant get less than 21-22mpg....even on the highway at 90mph with the ac on and a FULL LOAD in the car

06 wrx....td04 tbe and tuned
Try boosting more in residential more lol
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Old 12-28-2012, 12:53 PM   #18
spintheground
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IF your mpg turns out to be bad still, try a new front O2 sensor. Worked for me.
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Old 12-28-2012, 07:16 PM   #19
ProfessWRX
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I get 21 mostly city (95%) and I haven't tuned fuel or timing yet. Was getting 22 stock, same conditions.
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Old 12-28-2012, 07:16 PM   #20
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Quote:
Originally Posted by spintheground View Post
IF your mpg turns out to be bad still, try a new front O2 sensor. Worked for me.
Agree.
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Old 12-29-2012, 12:48 PM   #21
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Quote:
Originally Posted by mod maniac View Post
I got 17 out of mine before I tuned it. Now I get 26 onthe highway.
What? How fast are you going?

I get worse mpg on the highway than I do city... that's because @ 70mph I'm @ 3k RPM... wish this thing was a 7 speed I get something like 14-15 hwy and 17-19 city.
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Old 01-02-2013, 11:18 PM   #22
STIcurby
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im having the same problem. bone stock 08 STI 5door and i just drove from ny to nh and was only getting like 20mpg on the highway at 65mph. on the highway at 65mph, in 6th gear my RPMs are at 3k. a little high? bought it new and now it has 66k on the clock.
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Old 01-04-2013, 12:03 AM   #23
Half Crazed
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normal.. that's just how they're geared!
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