H6 3.0 Milage

[Don]

I am new to the Subaru family as I recently bought a new Outback (U.S.) with
the H6
3.0 engine. I have about 2300 miles on it. It is a great car so far.

However, I was wondering if the gas milage will improve over time. I am
getting about 18.5 in mixed driving and @17 "city". The highest I have
gotten on mostly highway driving with 4 people in the car is about 22.3.
Anybody have any experience with this engine? Is there anything I should be
especially on the look out for?

Thanks in advance for any information you can give me.

Don

 

[null]

After doing it to mine I average about 21mpg(300 miles/tank) and this is
mostly 70mph-80 driving.

 

[Subarutoo]

Will your mod work for earlier models? I have a 2000 Leg GT Limited?

Thanks,

(e-mail address removed)

 

[Skweezieweezie]

As far as I know, the only Subarus that come equipped
with a bypass valve on the muffler are those that have the
H6 3.0 EZ motor. It wouldn't hurt to look, though. Check the
driver's side of the muffler for an "appendix" coming out of
the side of the muffler towards the front of the car, and then
re-entering the side of the muffler that is towards the rear
of the car. If I'm correct, the 4's just have a plain Jane "tractor"
style muffler.

 

[null]

I got a 1-2mpg increase. When I first did the mod (many moons ago) I pulled
the battery cable overnight. I
guess that's how you reset it. One of these days I'll get on of the obdii
dataloggers and see if it's me
or the car. Not to bash Subaru but my wife's Grand Prix with the 3800 gets
amazing gas mileage.
On highway trips we average 30+ mpg around 25-27 city. On 87 octane! The
engine is about the only
thing I like about that car.

 

[John A. Mason]

I average 25 consistently in mostly rural/small city driving. I use 93
octane 75% of the time, regular the rest of the time.
My car has 25,000 miles currently. I love the H.6!
John
Athens, GA

 

[Lance B]

I average 25 consistently in mostly rural/small city driving. I use 93
octane 75% of the time, regular the rest of the time.
My car has 25,000 miles currently. I love the H.6!
John
Athens, GA

Although I'm in Australia and we are in litres/100Kms I think the
conversion is 3.86lts per US gallon. The best mileage I have received
is 8.23lts/100Kms which calculates to 29 miles per US gallon. This was
at a constant 120K/h (75mph) with the air on and 2 people with a small
amount of luggage.

I consistantly get 11.5lts/100Kms (21mpUSg)around Sydney with air on.
I use our 98 octane unleaded (I think this octane rating is different
to the US type but is our top octane type. It maybe the same as your
top octane which I think is 93?)

 

[Al]

Although I'm in Australia and we are in litres/100Kms I think the
conversion is 3.86lts per US gallon. The best mileage I have received
is 8.23lts/100Kms which calculates to 29 miles per US gallon. This was
at a constant 120K/h (75mph) with the air on and 2 people with a small
amount of luggage.

I consistantly get 11.5lts/100Kms (21mpUSg)around Sydney with air on.
I use our 98 octane unleaded (I think this octane rating is different
to the US type but is our top octane type. It maybe the same as your
top octane which I think is 93?)

I'm sorta disappointed with the mileage I'm getting so far. This is how
it breaks down:

1441 mi total: 20.4 mpg overall
best mileage: 29.5 mpg on a 372 mile trip
local mileage: 14.9 mpg

Hope it gets better after break in. And when would that be?

My '95 got an overall of 19.1 mpg, not much better than my '91 Jeep's 18
mpg.

Al

Al