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Old 12-24-2010, 11:22 AM   #31 (permalink)
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Update..

1st tank
361 mi / 14.1 gal = 25.6 mpg (50/50 city highway)
display showed 26.4 mpg

2nd tank
363 mi / 14.4 gal = 25.2 mpg (50/50 city highway)
display showed 26.4 mpg

On that second tank, I drove in this pattern:

60 mi city with display @ 26.4
180 mi highway with display up @ 28.2
120 mi city with display back @ 26.4

My math tells me that the computer mpg for the 180 mi highway stretch is 28.8 mpg. Surprised by how little difference there is between city/highway.

So far on the 3rd tank
120 mi highway with display @ 31.0
20 mi city dropped it to 28.8

The calculated city mpg here is then 15.6. This city stretch was a lot of stop signs, stop and go, downtown traffic versus my normal suburban 'city' drive.

Some thoughts..

Displayed mpg is optimistic by about 1 mpg
City mpg is about 25 actual under my normal suburban driving but drops severely under downtown driving. Acceleration eats a lot of fuel.
Highway mpg may be around 28-30
I notice that under 60 mph results in best displayed mpg on the highway but that's too slow to safely keep up in 75 mph highways here. Not good aerodynamics and could use a couple more gears.

Side note, front windshield washers stopped working.
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Old 12-24-2010, 10:55 PM   #32 (permalink)
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3rd tank for me tuesday night, motor is definately breaking in. Mileage has jumped to 26.4 via readout with about 50/50 mix and a bunch of x-mas shopping traffic:(
So far my readout vs. actual has been almost dead-on, within a fraction of an MPG on both previous tanks.
I'm not hypermiling, coasting, drafting, or anything like that.....just driving it.
For it's size and AWD, I'm pleased.
Note, mine is also a M/T.

Last edited by rkcarguy; 12-29-2010 at 11:06 AM.
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Old 12-25-2010, 07:05 PM   #33 (permalink)
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I'm on my second tank on my '11 X, but with MT. First tank was a joke because of traffic, engine break-in, etc. However, I did get 27.3 on my way to work the other day (90% highway/10% traffic).

However, last night I managed to average 30.3 mpg on my way home. Total trip was about 35 miles and was 60% highway. The remainder was on some seriously hilly mountain roads. In fact, before I got off the highway and started climbing those hills, my average (displayed) was 34.0 mpg. Most of that leg was downhill, however.

Overall, I'm pleased. If I'm seeing 27+ on highway runs in the cold, with winter fuel, on a fresh engine, what more can I ask for? Time will tell...
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Old 01-02-2011, 02:33 PM   #34 (permalink)
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4th tank and the displayed mpg is only 22.8.

It's been very cold here with some snow, seeing 10%+ drop in fuel efficiency.
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Old 01-05-2011, 08:06 AM   #35 (permalink)
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21 mpg mixed driving may be about right..the new Foz is a big thing for a 2.5 litre engine to pull about the country..My 2010 normal asperated engine does less MPG than my 2005 turbo XT in the exact same driving. I think the turbo is working less to do the same work..
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Old 01-05-2011, 11:36 AM   #36 (permalink)
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Thumbs up 22.74 mpg

Just figured out my mileage for the first year of ownership, 54 fillups, 12,845 miles. 22.74 overal ain't bad, isn't great either but I'll take it. Second year should be better as I won't have the new engine tightness to deal with.
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Old 01-15-2011, 07:35 AM   #37 (permalink)
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I'm averaging 20.9 calculated over five fills so far, and it's broken 40 degrees F maybe three days in those four weeks. Top two tanks were at 22.9 and 21.9, both of those with 90% of mileage at 70-75mph over relatively flat terrain. My regular daily commute is 2.5 miles each way, and lunch runs/errands are rarely even that far, so I don't expect good scores out of any tank with a week or more of commuting. Even my old '03 Jetta TDI manual would drop to 35mpg from its usual 42+ if I didn't leave town on a tank.

Also, if you have any interest in comparing mileage, sign up at Fuelly.com. It was pretty widely used among the TDI crowd, and it's super-convenient -- mobile and SMS entry, your choice of US/imperial or metric units, lots of reports and exports. Right now, I'm the only 2011 Forester there (can't link directly, not enough posts yet).
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Last edited by VT_hawkeye; 01-15-2011 at 07:37 AM. Reason: weather
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Old 01-15-2011, 04:17 PM   #38 (permalink)
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Quote:
Originally Posted by VT_hawkeye View Post
Also, if you have any interest in comparing mileage, sign up at Fuelly.com. It was pretty widely used among the TDI crowd, and it's super-convenient -- mobile and SMS entry, your choice of US/imperial or metric units, lots of reports and exports. Right now, I'm the only 2011 Forester there (can't link directly, not enough posts yet).

I use it. Its a great site. Im happy with my 30mpg on the highway and 26mpg around town But since I do so much driving I spend about $50 a week on fuel. If I look at how much I have spent in all my fuel ups since I have been on fuelly in the past 3 months or so, its like $700
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Old 01-20-2011, 10:05 AM   #39 (permalink)
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I'm now seeing 25.5 mpg over the first 2500 mi on the readout.

Haven't calculated actual but it's probably 1 mpg lower.
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Old 01-20-2011, 01:00 PM   #40 (permalink)
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Still very new (only 250 miles, 2.5X Auto) but I'm getting 24.3 mixed suburban Chicago driving but it has been very cold.

On my way home from the dealer I saw 29.? but it has only gone down since, I would be happy with high 20's.
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Old 01-21-2011, 03:11 PM   #41 (permalink)
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Default MPG on the 11 Forester

I checked it over a 1400 mile run and added all the fuel intake and the miles and got 29. Checked it again with one tank and got little over 27 and next tank was 29. Being fair I am that guy in the right hand lane and very light on the pedal and run on cruise when I can. I could not do varied driving on break in but did keep it at 60 or less on the trip home from the dealership.
I do not have a PZEV vehicle so maybe that is why its a bit better, dont know.

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Old 01-21-2011, 03:42 PM   #42 (permalink)
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Default Drive slow, Draft or waste gas!

I have driven my Foz everywhere 38 states with a Cobb AP plugged in and monitoring gas mileage. The problems are the variables, traffic, hills, turns, etc. Here is the only accurate study I ever performed. While traveling across the bonneville salt flats on a non windy day with my Cobb AP plugged in and my speedometer calibrated to actual wheel size and confirmed on the GPS. There was accurate measurement of fuel flow and speed. This is in an 08 Subaru Forester Sports with a bike on the back and a roof rack. The following MPG's were reported in 5th gear. This car had 30,000 miles on the odometer.

40mph 36-37 mpg
50mph 30.5 mpg
60mph 23-25 mpg
70mph 23 mpg
80mph 16.3 mpg
90 mph 13 mpg
on the salt flats 126mph 7.7 mpg (no bike or roof rack) for this measurement, although I did go 128 mph with the bike and roof rack attached.

As we can conclude from this chart. You get good gas mileage by driving slow. Wind resistance is the enemy!

Drafting:

I have spent much time drafting trucks with my cobb ap and monitoring fuel consumption. My observation is that if you get like 2' behind the bumper you can get a slight pull from the vacuum behind the truck and greatly reduce gas mileage. This is very dangerous however. At a distance of 5' or greater very little if no gas savings is noticed. 50-100' behind the truck you get added resistance. However, if you get back in the "dirty air" of a semi truck about 150' back where the air is turbulent you get about 2 mpg's better gas mileage. Who knew? You know when you are in the dirty air when it feels as if it is shaking your car around from wind. You would think that that was adding resistance, but by my observations it has reduced air resistance.

Frank
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Old 01-21-2011, 03:50 PM   #43 (permalink)
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Default Bad Habits

For the record. I do not like to drive slow. I did this study, and I still waste gas. I like to drive fast thats why I bought the turbo.

My car is gutted that saves gas too! Why are you all driving around with seats and spare tires in your car?
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Old 01-22-2011, 07:26 AM   #44 (permalink)
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picked mine up Tues and getting 17 mpg, with mixed driving. better than my baja
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Old 01-26-2011, 10:04 AM   #45 (permalink)
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Default bad MPG in WI

Picked ours up just before New Years. It's been consistently in the teens-twenties here in Wisconsin. Only at 400 miles so far, but I barely got 17 on the first fill-up (all city) and I'm at 21.5 on the second (half city-half hwy). Was hoping for better, but keeping an eye on it until broken in and the weather relents.

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