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Old 03-06-2005, 01:03 PM   #1
persianpunisher
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Default Terrible Gas Mileage! Help

Hey, I have an 05 OBS SE. Its finished with the break in period and I broke it in correctly. I dont drive my car hard at ALL. I drive 60/40 City and Highway, and I am never hard on the throttle. The thing is, I get like 20mpg in a FULL tank. I fill the tank as much as possible, and run until Empty and I am getting a measly 300-320 miles a tank. Thats RIDICULOUS. Whats wrong? I am at 4500 feet above sea level, but i dont think that affects gas mileage THAT significantly. WHATS GOING ON!!! PLEASE HELP!
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Old 03-06-2005, 01:06 PM   #2
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If you live in a really cold climate, they put additives into the gas, and pretty much lowers the octane of the gas. So in return you get crappy gas milage during the winter. In my wrx i get around 25-26mpg on average during the summer, then it drops to around 20mpg during the winter time.
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Old 03-06-2005, 01:11 PM   #3
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Are you measuring gas milage by dividing the miles driven by the gallons used or are you guessing from the gas gage? My Forester with at 15.7 gallon tank (~2.5 gal reserved after fuel light goes on) will give me about 325 miles per tank. My car yields about 22-24 mpg for my local driving and this is a measured calculation.
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Old 03-06-2005, 01:17 PM   #4
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Quote:
Originally Posted by Hayes
Are you measuring gas milage by dividing the miles driven by the gallons used or are you guessing from the gas gage? My Forester with at 15.7 gallon tank (~2.5 gal reserved after fuel light goes on) will give me about 325 miles per tank. My car yields about 22-24 mpg for my local driving and this is a measured calculation.

The Forester has a 15.9 gallon(60L) fuel tank....just like the Impreza.
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Old 03-06-2005, 03:07 PM   #5
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I just filled up yesterday and got 21.6mpg. That is with hard driving when the roads were dry, and lots of low gear high rpm driving in snow.
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Old 03-06-2005, 03:11 PM   #6
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I used to get around 20-22mpg in my stock wrx. Subaru's are just not the best for fuel economy. It can really guzzle it down if prompted.
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Old 03-06-2005, 03:26 PM   #7
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I measure MPG by miles driven/ gallons of fuel. Mf-DIF, you are getting 20-22 mpg in a WRX, I am getting 20 in an NA car. Can anyone help me please? I dont think it lowers the octane, cause if it did, it would cause pinging and it doesnt. WHATS THE PROBLEM??
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Old 03-06-2005, 03:34 PM   #8
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I have an 04 OBS. I get 20-22 in mostly city driving. Don't sweat it. Sticker says 23 city/30 hwy. How many miles do you have on it? I have a tad over 9000 and I still don't think its broken in.
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Old 03-06-2005, 04:33 PM   #9
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Winter gas is crappy and causes lower gas mileage. I get 240-260 miles a tank right now. In the summer I get 360-380 a tank.
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Old 03-06-2005, 04:59 PM   #10
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I get around 200 miles per tank in the city..
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Old 03-06-2005, 05:26 PM   #11
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Quote:
Originally Posted by persianpunisher
I. WHATS THE PROBLEM??

It 'aint broken in yet and winter gas(oxygenated....NOT lower octane) = so-so MPG.

...quit worrying about it.



.....NEXT.......???
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Old 03-06-2005, 06:37 PM   #12
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What oil are you using?
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Old 03-06-2005, 06:46 PM   #13
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i am using Mobil one, I have already had my 1k oil change. I have 3500 miles on, are you telling me that its not broken in yet?
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Old 03-06-2005, 07:11 PM   #14
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viscosity?
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Old 03-06-2005, 07:26 PM   #15
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I wouldn't expect peak mileage until at least 5000 miles.
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Old 03-06-2005, 09:35 PM   #16
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Quote:
Originally Posted by persianpunisher
i am using Mobil one, I have already had my 1k oil change. I have 3500 miles on, are you telling me that its not broken in yet?

...most aren't, really, broken in until 7500-10,000 miles......surprise.
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Old 03-06-2005, 09:42 PM   #17
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it just sounds like you are doing the math wrong. if you are getting 20mpg and you're still getting 300-320 p/tank, it means you are using every single drop of gas in your tank. i've driven 40-50 miles with the light on, and i barely hit 15 gallons at the pump.
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Old 03-06-2005, 10:11 PM   #18
persianpunisher
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how am I doint it wrong? I fill the tank to the rim and drive until almost every single drop is gone. THAT tank is getting me 300-320. So I divide that by, say, 15 and I get 20-22 mpg
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Old 03-06-2005, 10:24 PM   #19
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Quote:
Originally Posted by persianpunisher
how am I doint it wrong? I fill the tank to the rim and drive until almost every single drop is gone. THAT tank is getting me 300-320. So I divide that by, say, 15 and I get 20-22 mpg
why dont u divide by the actual number of gallons you fill up, that way, you won't be approximating. you really gotta drive a while with the light on before even getting to 15.
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Old 03-06-2005, 10:27 PM   #20
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fill tank......make note of actual mileage........drive.....fill tank....note gallons filled...note new mileage.....divide....get real answer......

....and quit yer cryin'.....everything is about normal for your car at this point....winter gas and not broken in yet.
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Old 03-06-2005, 11:16 PM   #21
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Just to be sure you may want to check your air filter. Although the car is new , environmental factors can get it dirty pretty quick and decrease mileage.

But as a number of people have mentioned winter gas does a number on gas mileage. Uncle Scotty is right on. I fill the tank and reset my trip odometer. When I fill again I write down the amount of gas I put in and divide that into the mileage driven displayed on the odometer. I always refuel at the same place (3/4 empty mark) if my intent is to measure mileage. I have found that measuring at other places gives inconsistent results (say at half full). Having been on the board a while and reading older posts I donít trust the low fuel warning light.
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Old 03-06-2005, 11:29 PM   #22
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20MPG is good, what's wrong with that?

I used to get a lot less in my Mustang 5.0L or even in my V6 Firebird.

Now I get around 20MPG.

Things to consider.

1. Your OBS is not very aerodynamic.
2. What kind of tires do you have?
3. You have full time AWD (ie Full time Four wheel drive without a low gear range)
4. Your not driving pure highway, and you have a 4 cylinder engine which revs higher than most cars at highway speed.
5. Your still getting twice the mileage of most SUV's.

Are you using American Gallons or Imperial Gallons?
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Old 03-07-2005, 12:16 AM   #23
persianpunisher
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I am using whatever gallons are in teh Subaru manual. OH, and Brutemj, I do JUST what you do, sorry if I worded it different so it seemend otherwise. 20mpg doesnt seem normal for a car, when my buddies 2.5rs with 750 miles gets like 24mpg. I am on the stock tires. By the way, I was reading somewhere that revs dont DIRECTLY impact mileage, its how much the pedal is depressed
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Old 03-07-2005, 12:18 AM   #24
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Would they still be putting winter gas in our stations out here? Its like 55 degress outside
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Old 03-07-2005, 12:22 AM   #25
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Dude, like everyone has said, ITS NORMAL..Deal with it, the revs directly impact the amount of fuel used. What do you think is causing the engine to run at a higher speed, more air and more FUEL!
Not a flame, just stop whinning
SCOTT
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