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Old 05-05-2011, 12:11 PM   #1
maxpower_454
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Default Best Gas Mileage with 2.0T??

I know most people on here say that gas mileage is for hybrids and WRX owners shouldn't worry about it but I disagree so don't reply if that's all you're going to say. My WRX is my DD and I have a 46mi commute that is 95% highway so I'm starting to think about gas mileage with fuel getting so expensive. I'd hate to have to sell my car because of gas mileage...

So I'd like to know, who here is getting the best gas mileage? I'd like to keep it apples to apples so only drivers with a 2.0T powertrain should respond - meaning 02-05 US WRX powertrain. Please state:

Year
Average mpg
Any mods that would affect gas mileage
Percentage city/highway miles

I'll start.
2005
25-27mpg
Cobb Stage 2, Cobb catted DP, gutter UP, Borla hush catback, STi wheels
90% highway usually cruising around 70-75

What else can be done to increase gas mileage? Different tune? Intake? I haven't tried the 'economy' cobb tune yet.
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Old 05-05-2011, 12:15 PM   #2
SoGardSuby
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cruise at 60-65 will probably help out some
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Old 05-05-2011, 12:20 PM   #3
Spenk
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problem: you bought an inefficient car for commuting

solution: sell your Subaru and buy a Mazda2
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Old 05-05-2011, 12:49 PM   #4
bad grocerygetter
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03 wagon
22-25mpg
Cobb stage 2 catless turboback, catless uppipe, lightweight konig wheels wrapped in toyo proxes 4s intake silencer delete.
prob 70% highway commute 30 miles one way. Usually 65-75 mph. Meh...don't really care about mpgs though. good luck with your findings though.
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Old 05-05-2011, 01:07 PM   #5
kaetos03
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Quote:
Originally Posted by Spenk View Post
problem: you bought an inefficient car for commuting

solution: sell your Subaru and buy a Mazda2
Or a PRIUS....

Tip: Let your foot of the gas... or take a train/bus.
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Old 05-05-2011, 01:12 PM   #6
kpotzmann
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Full under-body try would help, as would blocking off some or all of the grill. When you do this you need to watch the temps to make sure you dont go too far. I'm guessing that if you blocked off the Lower opening 100% you would be fine for Hwy driving.

You could prob Block the entire front in the winter and not see any issues. I'm guessing the full Under-body tray and grill block might get you 3-6mpg... I'm currently trying to come up with a removable block for the lower opening in my 05' 9-2x. In when just driving around, pull it for fun.
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Old 05-05-2011, 01:38 PM   #7
JhnBrackett
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2002
20.5 mixed, 25 highway [avg 80 mph, 7000 ft elevation]
Stage 2.5 w/ 6 speed [K&N CAI, TBE, STI TMIC, Accessport w/ Stage 2 91 octane map]
BF Goodrich Super Sport G-Force A/S - 40 psi
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Old 05-05-2011, 02:25 PM   #8
subiewrx001
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Get a tune that is a little leaner than 14.7:1 which is stoichometric it will help with closed loop fuel economy.
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Old 05-05-2011, 03:56 PM   #9
Concillian
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~23-26 MPG depending on driving.

~24 without advanced fuel conservation driving(which is kind of annoying to do.

I've gotten 29-30 MPG on a trip, but that was FLAT and SLOW driving through Oregon, who has low speed limits and have some reputation for targeting CA plates for tickets, I basically drove 55-60 for 300+ miles of pretty flat land.

Commute is 22 miles. There is a large hill between my house and my work, about 1.2 is a significant uphill grade (followed by downhill).

Almost every bolt-on (Intake, silicone inlet, 18g, Process West TMIC, TGV delete, PnP exhaust manifold, uppipe, Invidia catted DP, Borla hush, fueling mods, self tuned via open source.

There are two problems with the WRX with respect to fuel economy... the aero is not so aerodynamic, and the engine is not the best design for fuel economy. The 2.5L is a much better design for fuel economy, which is how they can have 23% more displacement, but get about the same mileage as the EJ205. You're not going to do much better than what you have now. If you need significantly better, you need a different car.

I always wondered why they never released a 2.1L with the EJ205 block, a 2.5L crank and small port AVCS heads. Raise compression a bit and stick with the TD04 and I think it has potential for 30MPG in real world driving without being a total dog on performance.

Last edited by Concillian; 05-05-2011 at 04:04 PM.
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Old 05-05-2011, 04:03 PM   #10
Concillian
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Quote:
Originally Posted by subiewrx001 View Post
Get a tune that is a little leaner than 14.7:1 which is stoichometric it will help with closed loop fuel economy.
If you care about this kind of thing, this will also skyrocket NOX emissions.

NOX emissions spike really high in the mid 15:1 range. This is why the lean burn engines that have made it to consumers run leaner than this. They avoid 15:1-16:1 because you cannot pass emissions in this range.

A little lean is not good. You need to go gung ho lean, and it's not easy to get our ECU to do that, as far as I know (but could just not know the right parameter to do it).
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Old 05-05-2011, 07:34 PM   #11
thefoos
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^You do get the best economy around 15.5:1 though...

You also only revealed part of the picture. Which is the "worst" emission? Sure, NOx goes up (skyrocket is an overstatement), but CO and CO2 drop. Also, remember you thinking about ppm measurements. If these things were measured in an aggregate view, your total emissions would be less. You're using less fuel.

I've always gotten good economy with my 2.0L. I bet it would be better with a 79mm crank.

If you're not wanting to modify the motor or spend big money, I've seen the best economy with a properly tuned stg 2 setup on a 2.0L.

02 WRX
catless uppipe, downpipe, exhaust
26-29mpg, mostly highway, 90 mile commute

02 WRX
VF43, supporting mods, 820 cc/min modified stockers, E85
21-22mpg, mostly highway, 90 mile commute

02 WRX
Stock, 565 cc/min injectors
24-25mpg, mixed driving

One last note. Stay with stock 440's or 565's injectors if you care about fuel economy.
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Old 05-05-2011, 07:54 PM   #12
subiewrx001
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water/meth, spt intake

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^^both are very good points but I would flash your stage 2 map a few days before emissions then just flash the eco map after. Invest in a AFR gauge then you will know exactly whats going on.
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Old 05-06-2011, 01:51 AM   #13
prokaw875
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Version 8 EJ207
04 outback sport
Stock wheels
Stage 2 with walbro & 565cc
60% highway for 50mile round trip commute
70-85mph with daily wot 8,000rpm rips

17-20mpg
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Old 05-06-2011, 07:35 AM   #14
450exc115
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Vf30
Pinks
Prodrive. Dp to Cobb. 3rd cat. Aps mid pipe and sti. Can

23-24 mix 80-20 hey/city
Cobb vf30 91 octane map
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Old 05-06-2011, 10:19 AM   #15
quazimoto
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Best economy comes from a bigger turbo. As long as you drive it conservatively you will spend alot less time in boost using less gas due to the much higher boost thresh hold. I can drive around all day long and never leave vacuum and go into positive pressure.

26-28 city 32-34 hwy
16G-XT 650cc injectors,EL header,BPM TMIC,TGV deletes,TBE,Halman MBC,APS 65mm CAI,APS inlet
self tuned with Opensource. Target a 15:1 AFR closed loop
tires inflated to 35 psi all around
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Old 05-06-2011, 11:22 AM   #16
ogboot
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psm

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02 WRX
Stage 2 Catless
K&N Typhoon, Turbo Inlet, SRS Turboback

avg 25mpg mixed, 28mpg on 90% highway trips
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Old 05-06-2011, 12:07 PM   #17
maxpower_454
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Quazimoto and ogboot, what tunes do you guys have? Custom? dyno?
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Old 05-06-2011, 01:49 PM   #18
quazimoto
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Self tuned with Opensource on the road.
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Old 05-06-2011, 04:32 PM   #19
bushman95
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I have a 2004 wrx with a catless up pipe and I get around 32-34mpg highway driving very conservatively, never run any boost. I drive a 300 mile commute every other weekend.
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Old 05-06-2011, 08:28 PM   #20
Byzantium
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I have never gotten more than 25 mpg on a completely stock WRX. And that 25 mpg was on a 500 mile road trip. On MY WRX I get 18-19 mpg highway (or at least 80%) on average, but I'm heavily modified. Nobody who gets over 20 mpg should ever complain.

Last edited by Byzantium; 05-07-2011 at 08:24 AM.
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Old 05-06-2011, 08:35 PM   #21
shadowmd
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2.5 hybrid 367whp/363wtq

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05 wrx
protuned by Turbo XS
vf34
iag 38mm ewg
gt spec EL header
565cc injectors
walbro 255 fp
full tbe
etc

I get about 22mpg around town and about 28-29mpg on the highway so I'm pretty happy.
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Old 05-06-2011, 09:06 PM   #22
nfm
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To tweak the closed loop AFRs, does anything else has to be set besides "Closed Loop Base Fueling Target"? I currently have 14.87, but thinking of 15.01. Is 15.5 safe? I'm running around 40 degrees of timing in cruising ranges.
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Old 05-06-2011, 11:51 PM   #23
rydog
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2004 WRX 5spd,
Cobb Stage 2,
23-25 in 50/50 mixed driving
The best I got was about 29, when it was stage 1, loaded to the max with my crap, during my move from DFW to STL back in Aug of 05.

Im getting pro tuned in a few weeks hoping to keep the same mpg's on E85 with a VF39.

2005 92x Aero 4eat.
Stock, and it guzzles gas. All city, about 18. Wife was getting about 21mpg on a 40 mile R/T, 99% highway, commute.
Cant figure it out.
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Old 05-07-2011, 02:20 AM   #24
monsta121
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Quote:
Originally Posted by rydog View Post
2004 WRX 5spd,
Cobb Stage 2,
23-25 in 50/50 mixed driving
The best I got was about 29, when it was stage 1, loaded to the max with my crap, during my move from DFW to STL back in Aug of 05.

Im getting pro tuned in a few weeks hoping to keep the same mpg's on E85 with a VF39.

2005 92x Aero 4eat.
Stock, and it guzzles gas. All city, about 18. Wife was getting about 21mpg on a 40 mile R/T, 99% highway, commute.
Cant figure it out.
Doesnt E85 drastically decrease fuel economy? I know it decreases it but by how much I have no idea. On another thread someone was saying that at current gas prices its still not worth switching to e85 because of the drastic decrease in fuel econ. Can anyone confirm?
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Old 05-07-2011, 12:00 PM   #25
ogboot
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Quote:
Originally Posted by maxpower_454 View Post
Quazimoto and ogboot, what tunes do you guys have? Custom? dyno?
Self tuned, road. Nearest AWD dyno is hours away.
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