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Old 08-22-2005, 11:48 AM   #1
joeyvaz
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Default Poor gas mileage in my '03 WRX

I'm wondering what the typical gas mileage is for WRX owners. I'm getting 13-14 MPG city from mine. All I have done at this time is a turbo back exhaust. I had a Cobb AP, but since removed it.

I must also note that my CEL is on now too. MAF problem. I'll check the exact code and post it. I'm almost positive that this is causing my MPG to be much lower than they should be. I was just reading the Sept 05 Road and Track and it says that the WRX should get 20 MPG. If this is true, something is definitely wrong w/my car.
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Old 08-22-2005, 11:56 AM   #2
MomoWRX
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I have a TBE and get anywhere from 19-22 city when i drive like a normal person and 29 hwy. When i have some fun and stretch the gears out i get 15-16. I use to wonder how people got 21 city and 29 hwy. Its all in how you drive the car. Don't excel hard and do the speed limit and you'll be surprised. Take your time when you excel from a light and don't keep it to deep into boost and you'll see the diff. In other words, drive as if your 90 and your in a corola.
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Old 08-22-2005, 12:01 PM   #3
joeyvaz
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19-22? I wish I could getr those numbers with the way gas prices are nowadays. I've been driving much more conservatively lately do to an accident and stuff, but I don't see a major difference in my case. As a matter of fact, I probably get single digit MPG when I drive hard. It's crazy.

I may have to take it into the dealer (one that is ok w/mods) to check out the CEL and poor MPG. We'll see.

Anyone else have any input?
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Old 08-22-2005, 12:04 PM   #4
JeffrWRX
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Do all the maintenance related items, reset the ECU, and drive like a grandma. I did that and at first I got crappy MPG due to the reset but once it settled my MPG went up. I was getting 15-16 on street, now I get 18-20. I recently took a long trip ~400 miles and I clocked 29MPG while I was going 80 MPH. I also opened her up a few times on the trip.

-Jeff
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Old 08-22-2005, 12:04 PM   #5
ronaldwrx
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how many miles are on the car? maybe it just needs some maintenance done ..

oil filter/new oil, air filter, fuel filter, pcv, tranny, diffs .. some of that can effect mileage. also check tire inflation ..
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Old 08-22-2005, 12:26 PM   #6
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Mine is a 2004 (purchased in late Aug '04), already driven 26k miles.
I have catless UP, high-flow catted DP, Y-pipe, Ecutek for nearly 10k miles.
Intake and catback are all bone stock.
Gas mileage doesn't change a lot before and after the mods (on avg maybe less than 0.5 mpg change but highly depends on my driving style). Still getting around avg 24 MPG (for 4EAT I think it is still good).
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Old 08-22-2005, 12:51 PM   #7
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Quote:
Originally Posted by ronaldwrx
oil filter/new oil, air filter, fuel filter, pcv, tranny, diffs .. some of that can effect mileage. also check tire inflation ..
agreed

Also, get a boost gauge, and learn when your on/off boost. If you can learn to pull from lights off boost, this will help HUGE!
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Old 08-22-2005, 01:16 PM   #8
joeyvaz
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I have 25,200. Engine oil is changed every 4000-4500 miles (Mobil1 Syntec) I do have boost, EGT, and Air/Fuel Ratio gauges. No other mods since I removed my Cobb AP. I'll try a reset of the ECU. I'll probably take a look at the plugs this weekend too. BTW, I use strictly 93 octane since day one.
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Old 08-22-2005, 01:26 PM   #9
Valhakar
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Put the COBB back on or replace the stock turbo-back.


2003 WRX w/55K miles

Stage 2 COBB + Larger TMIC and a few other goodies, Protuned.

Before Protune - 22-24 in mixed DC traffic. 25-29 MPG pure highway.

After Protune - 22-24 in mixed DC traffic. 27-31 MPG pure highway.

Dyno plots shows 300+ crank HP.

The WORST milage I have gotten is 17 MPG and that was after a HPDE. Even when I do numerious 4 gear pulls to redline, I still get over 20 MPG.
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Old 08-22-2005, 02:31 PM   #10
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with a tbe, intake, mbc @ 17lbs, and a slightly smaller tire (higher revs up top cruising..91mph=4000rpm i think
i get something like 35mpg
24 around town.
whats the secret? watch your boost gauge, give your car enough gas to goto .0 (no boost no vaccum) and shift around 3000rpm. sometimes its better to rev a pinch higher and give it a little less gas. its a little slow getting around, but if im in a rush, ive got 17psi on tap.

actually, if im in a rush ive got 8psi on tap. gas is 2.79 a gallon now, f that haha
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Old 08-22-2005, 02:48 PM   #11
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I have taught myself how to drive and avoid staying out of boost territory. Yeah it sucks, but hey :/

When I get to a quarter tank left, I fill'er up. Usually when I have a quarter tank left, I'm at ~275 miles give or take a little. Think it works out to being about ~24-27mpg city and highway (I mainly travel on highways, rarely around town).
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Old 08-22-2005, 04:42 PM   #12
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I don't see the point of buying a WRX and then driving it like an old, senile 80-year-old.

Stop whining.

If you wanted good gas mileage you should've bought a Honda.
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Old 08-22-2005, 04:46 PM   #13
dcwrx2
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The point is, his gas consumption shouldn't be *that* low with his listed mods, no matter what is his driving style.

Joeyvaz, just curious how did you calculate your mpg?
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Old 08-22-2005, 05:02 PM   #14
Rick Schu
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How are you calculating your mileage? The correct procedure is:
1. Fill it up until the pump clicks off.
2. Reset your trip odometer.
3. When you go to refill again, flll until pump shuts off (same gas station/same pump)
4. Divide the numbers of miles you went by the gallons you put in.

It sounds stupid to mention this procedure, but some people try to calculate by how many miles they went until the fuel light comes on or how many miles in a half tank and those are way inaccurate methods.

If you are calculating it correctly and have a laptop, get the Tari free logger and look at your A/F learning - you might have a bad O2 sensor (they don't always trip a CEL).
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Old 08-22-2005, 05:59 PM   #15
laoba
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it's all driving habits. coming from an avg of 15-20mpg mostly city/rush hour I tried doing it for a full tank (also for sake of rising gas prices). staying off boost as much as possible, shifting earlier, etc. my next tank came out about 23mpg. I also find you get better mpg with higher octane, but im stuck with CA 91.
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Old 08-22-2005, 06:50 PM   #16
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lol yeah it is mostly in your drive habits.... I get 17 - 22 mpg average in my 05 and also got the same when I had my 02. I have managed to get 10 miles to the gallon for one tank of gas just for fun. Lets just say that I did not go higher then 2 gear driving around. If you go very light on the gas and don't go above 3k your milage should increase.
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Old 08-23-2005, 07:05 AM   #17
joeyvaz
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Rick, I was letting the tank go to near empty. Filling it up, then letting it go to near empty again. the way you described makes it for a more accurate description. I'll try that this weekend.

Thanks to all that had USEFUL information for me.
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Old 08-23-2005, 08:48 AM   #18
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I've been driving more on the grandpa-ish side and I've been averaging about 25mpg city (don't do a lot of highway driving... maybe 10-15 miles at most out of a full tank). I stay out of boost for the most part (because of the crap gas prices), and shift around 2500-3000 rpms, and I have been fine. I've got an 02 with 83k on it. Having the boost gauge definitely helps. I usually wait til I get to 1/4 of a tank, fill up, note the amount of fuel that I put in (9.06 gal this time around), and then once I get back down to 1/4 of a tank, divide my mileage (reset the odo. when you fill up) by the gallons you put in. Pretty simple.
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Old 08-23-2005, 08:51 AM   #19
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Quote:
Originally Posted by joeyvaz
Rick, I was letting the tank go to near empty. Filling it up, then letting it go to near empty again. the way you described makes it for a more accurate description. I'll try that this weekend.

Thanks to all that had USEFUL information for me.
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Old 08-23-2005, 12:01 PM   #20
Valhakar
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Quote:
Originally Posted by TacticalNuke
I don't see the point of buying a WRX and then driving it like an old, senile 80-year-old.

Stop whining.

If you wanted good gas mileage you should've bought a Honda.
I don't see the point to make such mornic statement.

I just did my Monday commute. 110 miles each way. 28.9 MPG and I was in full boost to redline several times to get out and around snowbirds. With a turbo you can drive fast and still save fuel, you just have to use your brain more than your right foot.

28.9 MPG. I would like to see a Honda get that and still make 110 miles in 80 minutes.
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Old 08-23-2005, 12:12 PM   #21
Rick Schu
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I've driven the same 700-mile trip with 2 different ECUs. One had the Cobb stage 2 map (not economy). Average was 26-27mpg (75mph cruise). Also did the trip with a Vishnu off-shelf-map (stg 1 I think - same as Cobb stage 2) and got 29-31mpg!
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Old 08-23-2005, 12:17 PM   #22
Crash477
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*flame suit on*

do you guys think the K&N filter helps mpg, any more so than the stock filter?
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Old 08-23-2005, 12:23 PM   #23
Celly
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Quote:
Originally Posted by Crash477
*flame suit on*

do you guys think the K&N filter helps mpg, any more so than the stock filter?
Sure. Just keep it clean.
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Old 08-23-2005, 12:55 PM   #24
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i know it's been an issue of a lot of debates, but going to K&N improved my mileage from 15 to 16.5-17

(running away from angry K&N bashers)
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Old 08-23-2005, 04:30 PM   #25
Valhakar
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My 300-320 CHP stage 2 + got 28.9 MPG in 90 degree weather, averaging 82+ MPH using an ITG filter. More air = better running car.
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