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2003 LL Bean Outback H6 and 2019 Outback Base
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514 Posts
Is it the H4 or H6 ?

H4 gets about 24 HIGHWAY at 65 mph
H6 gets about 23 Highway at 62 mph
The slower you go...the better the mileage
Also get a tunr up/.......plugs....air filter...fuel filter

AWESOME CARS !!! Good Luck
 

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Premium Member
2004 Outback Wagon, Mystic Blue Pearl
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4,945 Posts
Yeah, I average 20-22 in town and 25-26 on the highway with my 2004 H4. If I am taking it really easy I can get 27 on the highway, but that's rare.
 

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I simply cannot abide useless people.
2006 2.5i and 2002 3.0 wagons.
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12,307 Posts
Is it the H4 or H6 ?

H4 gets about 24 HIGHWAY at 65 mph
H6 gets about 23 Highway at 62 mph
The slower you go...the better the mileage
Also get a tunr up/.......plugs....air filter...fuel filter

AWESOME CARS !!! Good Luck
Then you're doing something wrong.

My H4 gets right at 28-30 MPG at 65MPH.
 

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Premium Member
2004 Outback Wagon, Mystic Blue Pearl
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4,945 Posts
H4= 2.5L 4 cylinder.

H6= 3.0L 6 cylinder.

The 2.2 was only available in 1995 and 1996 models with manual transmissions.
 

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I simply cannot abide useless people.
2006 2.5i and 2002 3.0 wagons.
Joined
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12,307 Posts
H4 meaning 2.5

H6 meaning 3.0
 

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I simply cannot abide useless people.
2006 2.5i and 2002 3.0 wagons.
Joined
·
12,307 Posts

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Premium Member
2004 Outback Wagon, Mystic Blue Pearl
Joined
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4,945 Posts
They had a 6 cylinder in this body style? I didn't know that. This was the 4 cylinder. I assume the 6 cylinder is a V-style engine?
Nope, hence the H. All Subarus have horizontally opposed cylinder banks, or boxers as they're often called.
 

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Premium Member
2004 Outback Wagon, Mystic Blue Pearl
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4,945 Posts
Yeah getting to those two rear spark plugs can be a chore.
 

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2005 Legacy 2.5i Wagon 4EAT; 2005 Forester XS 4EAT
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672 Posts
The H6 is obviously stronger, and potentially more durable (head gasket issues are uncommon). It also uses a timing chain as opposed to a belt in the H4. The H6 only came with an automatic transmission.

I've gotten nearly 28 MPG in mine on the highway, running premium gas in it. I probably average around 20 in city driving. For an AWD vehicle with some balls, you can't ask for too much better than that.

The H6 isn't much bigger than the H4. Think about this: it's 1/2 liter larger, but has 2 extra pistons. I think it's about 1" longer overall than the H4.
 

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