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Subaru Forester MPG-Real World Numbers

175 messages,  Last post on Dec 08, 2009 at 4:03 PM

You are in the Subaru Forester Forum. Your Host is kcram

What is this discussion about? Subaru Forester, Fuel Efficiency (MPG), Wagon


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#61 of 175
Ethanol bad for MPG by samiam_68
Feb 22, 2007 (9:45 am)
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This is the first year that 10% ethanol blend is used in NJ. The mileage on my 04 FXT MT has never been worse. My winter average used to be 21+, it has now dropped to the 19.5-20.5 range. I never got below 20 until now.
 
I normally attribute winter conditions to a 5% MPG drop compared to summer driving. This year, it's 10% - 5% due to colder temps, and another 5% due to ethanol. This makes sense as ethanol makes up 10% by volume and has slightly over 1/2 the energy content of gasoline.
 
The governement has found yet another way to screw the consumer - our taxes are paying for ethanol subsidies AND we pay more at the pump due to lower MPG.
 
Life is grand...
#62 of 175
Re: Ethanol bad for MPG [samiam_68] by ateixeira
Feb 22, 2007 (11:04 am)
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Replying to: samiam_68 (Feb 22, 2007 9:45 am)

Stinks - even my Miata is faring worse. I used to go 300 miles on a tank, now it seems like I hit 260 and I have to fill up. I'm sure the cold weather is also contributing, but I hate having to get gas so often.
 
-juice
#63 of 175
Re: Ethanol bad for MPG [samiam_68] by jay_24
Feb 23, 2007 (6:02 am)
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Replying to: samiam_68 (Feb 22, 2007 9:45 am)

I've been using the ethanol for years in my 2001 OBW and have noticed little difference in MPG. Minnesota has required 10% ethanol for the past 5 or more years. Wisconsin does/did not. No noticable difference.
Cold weather affects my subie the most. Global warming has hit this year big time. Most years my mpg goes from 27 summer to 23ish winter. This year it has been 25mpg. Except for 2 weeks when it was near zero everyday. Then it was 24mpg.
 
Perhaps Ethanol and cold weather has a bigger effect?
 
I have changed to Shell gas this year due to my work office moving. Maybe the "Tier 1" gas that GM and Toyota recomends is better? ethanol or not?
 
--jay
#64 of 175
Re: Ethanol bad for MPG [jay_24] by ateixeira
Feb 23, 2007 (7:34 am)
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Replying to: jay_24 (Feb 23, 2007 6:02 am)

With pure ethanol the flex-fuel cars tend to get about 40% less range. So figure with E10 it's probably about 4%, which may not be enough that most people will notice.
 
Come to think of it, that's not nearly enough to cause the drop I've seen, so I'm sure it's the cold weather we've had lately.
 
-juice
#65 of 175
Re: Ethanol bad for MPG [ateixeira] by jim314
Feb 23, 2007 (7:46 am)
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Replying to: ateixeira (Feb 22, 2007 11:04 am)

According to the Wikipedia entry on gasoline, the 10% ethanol fuel (aka gasohol) has about 97% of the energy content of straight gasoline. On this basis you'd expect less than 1 mpg drop in mpg for vehicles getting less than about 30 mpg with gasoline.
 
http://en.wikipedia.org/wiki/Gasoline
 
Also since ethanol is an octane booster it ought to allow the fuel producer to dispense with other octane boosters and save on costs. Of course, ethanol is expensive to produce and is subsidized. Also it is more expensive to transport since at present 10% ethanol fuel cannot be transported by pipeline. As I understand it the gasoline base is shipped by pipeline and the pure ethanol is shipped by tanker truck. The two are mixed at the wholesale distribution point.
#66 of 175
Re: Ethanol bad for MPG [jim314] by ateixeira
Feb 23, 2007 (7:51 am)
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Replying to: jim314 (Feb 23, 2007 7:46 am)

3%, 4%, I was close.
 
-juice
#67 of 175
2006 Forester 2.5 X MPG by philj5
May 29, 2007 (6:15 am)
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I purchased the above manual transmission Forester almost 11 months ago. It currently has 12,000 miles. Combined driving (approx. 50% in town and 50% highway) is right around 27 mpg (non-ethanol gasoline). Highway mileage is 30 mpg. Since much of my driving is short trips, the 27 mpg is a pleasant surprise. I thought highway mileage might be a bid higher, but I tend to drive 70 mph. I need to do some testing at 65 mph to see if there is a significant difference. Compared to other vehicles in its class, the Forester 2.5 gets good gasoline mileage and it's a solid little car to boot!
#68 of 175
Re: 2006 Forester 2.5 X MPG [philj5] by kavoom
May 30, 2007 (3:52 pm)
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Replying to: philj5 (May 29, 2007 6:15 am)

I just came back from a 2400 mile trip towing my 1800 lb pop up camper. About 2K of the trip was towing. Without the trailer, I was right at 28 mpg. With the trailer it was right at 17 mpg. The total avg mpg was 19.7 mpg. About 25% of the gas was ethanol (South Dakota and Nebraska).
 
Not bad for pulling a trailer these days... Oh, I have an 07 Premium Package MT. This does compare to my 04 X where I averaged 21 mpg on the same trip twice. They changed the torque power ratios and not for the better in 06.
#69 of 175
Re: 2006 Forester 2.5 X MPG [kavoom] by ateixeira
May 31, 2007 (6:02 am)
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Replying to: kavoom (May 30, 2007 3:52 pm)

That's about what I got towing a trailer with my non-turbo. It really kills mileage.
#70 of 175
First tank 21 MPG by pbai
Jun 10, 2007 (1:19 pm)
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Replying to: ateixeira (May 31, 2007 6:02 am)

21 MpG for the first tank
07 Forester, 2.5X, auto, 240 miles

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