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Old 09-12-2015, 08:52 AM   #1
Matthobs
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Default 2012 WRX gas mileage question

So I just got my 2012 WRX and obviously I didn't buy this car to get good gas mileage other wise I would have gotten a hybrid or something. Any way I commute every week to and from the west coast of FL to the east coast. I Cruise in one straight line exactly at 70 MPH 2.8k RPM the whole way with 0 traffic its the most boring road in america. But It says im only getting 23MPG and about 300 miles for a on full tank of gas. Is this right? My tires are at about 38 PSI and I dont have mudflaps or a roof rack. Thanks for your input this forum is awesome.
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Old 09-12-2015, 09:01 AM   #2
JettyLife
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Sounds about right. Drop down to 65 and see if that helps. Also, I understand that you're adding air to your tires trying to increase mpg but watch how high you go because if they start to wear wrong you'll lose that tiny savings by having to replace your tires prematurely.
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Old 09-12-2015, 12:13 PM   #3
The Perfect Creature
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I get 23-24mpg. I feel that is very good mpg for a car such as this one.
I am Stage 2, BrenTuned, and have mudflaps....
In case it mattered to you.

I run Citgo 93, on a 91 Octane tune.

My meter almost always says 23.4.

Last edited by The Perfect Creature; 09-12-2015 at 12:29 PM.
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Old 09-12-2015, 12:23 PM   #4
fronton
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Seems like you should be getting a little bit better. I get 24-25 on road trips with stopping.

Do you get 23 mpg both ways on your commute? What brand gas do you use?
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Old 09-12-2015, 01:12 PM   #5
Matthobs
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Yup it seems to be right about 23 to 23.3 both ways, I was using sams club gas maybe thats the issue, ill try something like shell and see if it improves.
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Old 09-12-2015, 01:16 PM   #6
MaddMax
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Sounds right. If it's windy, MPGs will be effected. Florida is flat as a pancake so grade isn't an issue. Like others noted, if you drop the cruise speed to around 65mph, you're mpgs will go up by around 15%. 65mph seems to be the sweet spot in these cars. The car is rated at ~25mpg highway so you're close.

They lack of a sixth gear and the low compression motor hurts mpgs. It's old tech, it's not bad, it's just old.
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Old 09-14-2015, 08:11 AM   #7
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like everyone is saying, mileage drops exponentially as you go faster. They rate these cars according to the federal guideline that is total bullcrap, which is assuming 55 miles per hour on the highway.
I had a manual accord that could get almost 40 at 55, but at 75 it was 30. At 85 it was more like 25. Cruising at 100 would require 75% throttle, probably 15 mpg.
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Old 09-14-2015, 01:00 PM   #8
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Quote:
Originally Posted by rtv900 View Post
like everyone is saying, mileage drops exponentially as you go faster. They rate these cars according to the federal guideline that is total bullcrap, which is assuming 55 miles per hour on the highway.
I had a manual accord that could get almost 40 at 55, but at 75 it was 30. At 85 it was more like 25. Cruising at 100 would require 75% throttle, probably 15 mpg.
The EPA test has a specific drive cycle they have to follow that varies the speeds, but not in any meaningful way.

The short gearing on these cars makes going over 65 MPH a real mess for fuel consumption. I wish the STi 6th was longer for highway cruising, because 3k+ at 80MPH is terrible, but since it's the same as the 5MT 5th gear, it doesn't help. If you look at all of the new T-GDI engines, they can get 30+ MPG at highway speeds, and most of that improvement is not because of GDI.

My 2014 with a bunch of upgrades (stock turbo/block) gets about 23 mpg on 93 gas, 16ish on e85
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Old 09-14-2015, 06:49 PM   #9
mosnowbro
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if your roof rack has a faring, that will lower the milage but i get the same numbers with my Rack on.
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Old 09-15-2015, 01:53 AM   #10
2011WRXMT
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Seems a lil Low in my 2011 wrx I get 24-26 on long road trips running 75 and about the same in my bugeye running the same speed depending on wind as that affects the mpg. I think the highest on either car has been 27 but typically both are 24-26
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Old 09-15-2015, 08:27 AM   #11
wrxdan330
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I have hit 28 mpg cruising at around 57 mph on a 40 mile drive. Also on a 100 mile each way trip cruising at 78-80 mph (with flow of traffic) I averaged 27 mpg somehow. At 70 mph though I can't seem to get over 23 mpg.
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Old 09-15-2015, 09:33 AM   #12
Japereira88
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dropping down to 65 will definitely help. i tested it a while back with my commute to work, did 70 for one whole fillup and averaged about 23.4, did 65 for one whole fillup and stayed at about 24.9... not a huge difference, but a difference nonetheless.
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Old 09-15-2015, 10:46 AM   #13
playslikepage71
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Its a compound issue. Between the short gearing and the fact that air resistance increases with the square of your velocity going fast is going to give you crappy mileage. If we had another gear that would turn around 2500 at 80 we could probably manage 25 mpg at those speeds.
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Old 09-15-2015, 12:16 PM   #14
Matthobs
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So I drove back across the other side of Florida but this time I went below the 70mph speed limit, to 65mph in the slow lane and averaged 25.2MPG with shell gas and put mudflaps on that same day haha. Its amazing how much just 5 mph effects our cars with gas miliage. Oh well (btw i forgot to mention I did do a 3rd gear pull past a focus ST after he gave me a thumbs up)
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Old 09-15-2015, 12:28 PM   #15
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Do you use cruise control? That has a great impact on MPG and is in fact it's PRIMARY purpose. While there are people that CAN get better MPG without it, for 98% of Subaru owners, it's use is WAY better than your right foot.
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Old 09-15-2015, 07:20 PM   #16
hangmanfsc
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Quote:
Originally Posted by Matthobs View Post
65mph in the slow lane
^^^^ THIS! Cannot tell you how irritated I get when someone is CRUISING in the fast lane!

Anyways, like many other say, I really wish the last year in these cars where more of a hightway gear. My 6th gear @ 80mph is around 3k, which is kind of dumb.
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