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Old 08-02-2005, 04:24 PM   #1
maxler3
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Default cobb poor gas mileage

I installed stage two over a month ago and am very happy w/ it, except for the mileage, esp in economy mode, where i barely break 19-20 mpg w/ conservative driving. I had read reports of people achieving upwards of 24-27mpg using the standard map. Any possible causes for this? My first thought would be to change the airfilter, which i havent done yet since i got the car.

mods: invidia catless dp, gutted up, cobb AP, 04WRX manual transmission(26,500miles)
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Old 08-02-2005, 04:30 PM   #2
keirnna
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Yeah you really need to change your air filter. It probably looks like Dagobah. Get a nice K&N filter and that should help.
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Old 08-02-2005, 04:30 PM   #3
waktasz
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I get around 21.5 mpg in stage 1 to and from work (no highway) and get 27 mpg this weekend during a 500 mile road trip to virginia. What sort of driving are you doing? For city driving that's probably all you're going to get.
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Old 08-03-2005, 01:13 AM   #4
richde
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I was just thinking the same thing. I'm driving from OKC to Las Vegas right now, well...RIGHT NOW I'm in a hotel in ABQ, but you know what I mean. BTW, I've got an '05 wagon with an AP and intercooler hoses.

It's HOT, mid-90's, and driving with the economy mode with the cruise set at 74 I got almost 20mpg. I got tired of how sluggish it was so I went back to 91 octane (no super premium around) Stg 1, just to see, and barely broke 19mpg with a long stretch of that in NM with the cruise set at 84. So I decided I'd pay a little more for gas and still drive a fast car instead of neutering it for a few bucks. I hope it's just the heat and/or higher than normal highway speeds. I've also got a mountain bike on the roof rack, maybe that's part of it too. Around town running the 93 octane map I get 21 with mixed driving. My car never got higher than 24mpg (highway only driving) before the AP, and that was without a roof rack as well.

The million dollar question is if this is normal, does anybody get good milage crusing at 70+? I know I don't, and I also assume that the EPA estimates are probably for 65, if not 55. Geez, 55 is barely fast enough to use 5th!!

I'm just hoping that my car isn't a turd at just under 14K miles, it's quick, hits 14.5psi (read on the AP), at ludicris speed on a 90+ degree day running 93 octane, so something must be right.

Rich
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Old 08-03-2005, 01:20 AM   #5
cabe
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Dagobah.

LOL did anyone else get that?
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Old 08-03-2005, 04:22 AM   #6
humara
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i usually get no more than 17mpg with all "spirited" driving in the mean streets of LA.
on a recent road trip to SF i got 24mpg on the way up. and 26.8mpg on the way back. each way took about 5 hours exactly so the average speed was the same. maybe it was a headwind or tailwind. ha, i said tailwind.

ap stage 2 91 oct, helix up, helix catted dp, borla twin-tip catback, lead foot
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Old 08-03-2005, 08:53 AM   #7
CGM_WRX
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I am running the regular stage 2 93 octane map with just the downpipe and I averaged 30mpg on the freeway during my vacation last week. This was at 70mph with cruise control and a/c on.
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Old 08-03-2005, 12:11 PM   #8
keirnna
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Quote:
Originally Posted by cabe
Dagobah.

LOL did anyone else get that?
Nope, everyone else is too lame to read my post.
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Old 08-03-2005, 01:20 PM   #9
DougG
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Quote:
Originally Posted by keirnna
Nope, everyone else is too lame to read my post.
I read it, but don't get it.
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Old 08-03-2005, 01:22 PM   #10
Jsunn
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Economy mode works great I got just over 30 mpg on a move from Maine to Virginia. The key is not to be driving 85 to 90 on the highway. by slowing from 85 to 70 you will save a load of gas, even without economy mode.
It becomes so much less efficient when you are trying to go that fast with so little boost in the economy mode. Drag on the car from wind resistance increases by the square of the speed alone!

-Jason
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Old 08-03-2005, 05:03 PM   #11
TorqueMaster
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Quote:
Originally Posted by keirnna
Nope, everyone else is too lame to read my post.

I get it, but I won't admit it. Oh wait..... dang.

But to get back to business, I get 21 in the city and about 25 on the freeway (economy). Unfortunately, I am often sitting in traffic on the freeway so I don't count that number as being very accurate.

AP stage 2, MRT TB, gutted UP, go fast stickers
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Old 08-03-2005, 05:59 PM   #12
sonicmayhem
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Quote:
Originally Posted by cabe
Dagobah.

LOL did anyone else get that?
I got it. What an awesome reference. I'm an Electrical Engineering student, chances are my entire class would get that, those nerds.
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Old 08-03-2005, 06:41 PM   #13
Funkmonster
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I got 24 mpg last time I checked it, normal driving + a trip to the dragstrip

and I'm stage 2.5...
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Old 08-03-2005, 07:10 PM   #14
The Professor
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Of course we got the Dagobah reference young Padawaan.

I'm stage 2 and recently got about 27mpg on a 500 mile road trip to Ohio. That was with the AC (as low as I could take) and watching the boost gauge to stay out of the turbo when I did not need it (very easy to do). Tire pressure makes a bigger difference than you think so make sure they are full. Up to date air filter, plugs, fuel filter, fuel system cleaner......can you tell I like to get good mileage in fast cars. Damn paradoxical hobby.
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Old 08-03-2005, 07:41 PM   #15
MD04WRX
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Quote:
Originally Posted by richde
The million dollar question is if this is normal, does anybody get good milage crusing at 70+? I know I don't, and I also assume that the EPA estimates are probably for 65, if not 55. Geez, 55 is barely fast enough to use 5th!!
I got 29.11 mpg on stage 2 93 octane map - driving from the DC area to the MAIC meet at Perry Subaru in Norfolk VA and back - Approx 470 miles at 70 mph to 75 mph (some intervals at 80 mph).
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Old 08-03-2005, 07:58 PM   #16
Student Driver
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Quote:
Originally Posted by keirnna
Nope, everyone else is too lame to read my post.
Are you kidding? I laughed my a$$ of at work when I read it, but had to explain it to my co-worker. I then realized that I was, officially, a dork.
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Old 08-03-2005, 08:04 PM   #17
MUscooby
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Quote:
Originally Posted by cabe
Dagobah.

LOL did anyone else get that?
sadly yes.... geeks unite
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Old 08-03-2005, 09:41 PM   #18
Hiflyer777
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WOW, i can't believe some people are getting 30 mpg..... the absolute best i saw was just shy of 28 mpg but that was from Reno to San Jose......lots of DOWNHILL!!!! I guess i drive a bit hard/fast though.... I usually get about 22mpg and that's "spirited" driving with a mix of about 25% highway and 75% city. I'm Cobb 2.5 with VF34, pink injectors, STOCK fuel pump, intercooler hoses, intake hose, only one cat (stroming hi flow 3rd cat), SS muffler, silencer delete, still stock wheels and tires. And of course running crappy CA 91 gas. Kudos to those who get 30mpg!!!
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Old 08-03-2005, 09:42 PM   #19
darksands
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Stage 2.5 and getting 21-24 mpg. 91 crap gas too. Economy is all about how heavy your foot is. Drive under boost and you will get better milage.
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Old 08-03-2005, 09:48 PM   #20
hungy
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Stay off the boost. When I decided on a subie I also came to the understanding I had to pay to play. Clean your filter and stop calculating the mpg and just have fun.
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Old 08-03-2005, 11:10 PM   #21
01legacyOwn3r
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Weird, I'm getting avg 24 mpg per tank with about 70% city driving. I'm running Cobb stage 2 91 with a Helix catted DP and an Ansa cat-back.
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Old 08-03-2005, 11:13 PM   #22
Amplified2000
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All highway driving running Cobb Stage 2 93 v1.30(base) I got about 28mpg with the cruise set at 80 and the AC on. With a mix of city/highway I usually average about 24mpg. I havn't tried the economy map since I went to stage 2.
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Old 08-04-2005, 12:58 AM   #23
joe r
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Wow.

I am getting city 21 to 23 & highway 29 to 32.

I have,
Cobb stage2.
Bosal uppipe.
Helix catted dp.
Greddy EVO2 catback.
Samco ic,tb hoses.
Intake silencer delete.

I am also just running a base map & no real time map other than what is set when you DL stage2 as a base map.

joe r
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Old 08-11-2005, 06:02 PM   #24
ingko
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how is everyone calculating the mpg? i've driving my brothers stock wrx and i got a high of 22.5 in dc beltway traffic. when i get gas, i use my credit card and fill up the tank til it autostops. yesterday i gassed up after 216 miles and the car filled up with 9.6xx gallons for a whopping total of 22.5mpg.

i usually avg 70mph on the beltway. wut are you all doing to get near 30mpg? driving at 55? wut method do you use to get your mpg? it just seems outrageous the amount you all are getting.

oh yeah, with cobb stage 1, the car avg's 21mpg during mixed driving.
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Old 08-11-2005, 06:54 PM   #25
DougG
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I am getting about 20mpg around town (short trips, hills, A/C on) and 21-25 on the highway with 21.94 over the life of teh car (15 months, 13K miles). Cobb stage1, 93
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