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Old 03-10-2012, 10:04 PM   #1 (permalink)
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Talking 1998 Subaru Legacy Outback Limited

I have a 1998 Subaru Legacy Outback Limited that gets a constant 18mpg c/highway would I get better gas mileage with a six cylinder (I have 2.5L)? How much of difference if I put new catalytic converters on it? For they are plugged! Also I have an automatic would I better gas mileage with a 5 speed stick? John
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Old 03-10-2012, 11:15 PM   #2 (permalink)
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I have a 97 OBW and get a good 26 to 30 mpg, and that's going up and down the canyon, back and forth to town with 3 passengers (I live around 9000 ft and commute to 5500 ft) with 87 octane pump gas.

I would definitely address those cats and figure out why they clogged up in the first place. Cats don't clog up on their own, there's usually a culprit hiding behind the scenes.
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Old 03-11-2012, 01:52 AM   #3 (permalink)
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Age wouldn't have anything to do with it, would it they have been replaced yet. I heard from the dealership that I have to used genuine Subaru ones in order to turn my "Check Engine" Light off. John
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Old 03-17-2012, 08:15 AM   #4 (permalink)
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Quote:
Originally Posted by RBCC View Post
I heard from the dealership that I have to used genuine Subaru ones in order to turn my "Check Engine" Light off. John
I think the stealership wants your money bad. I went aftermarket cat with two new O2 sensors, and my CEL light hasn't come in over 50K. A couple of hours for install, and you're done.

I average 18-22 in town, and 25-27 hwy mpg.

Oh, and my '97 has over 150K on this engine, drivetrain has over 242K 5mt (the engine had to be replaced due to me 'trusting' my local dealership to do a timing belt replacement, and they didn't replace the idler pulleys - read kaboom.)

Later, T.J.
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Old 03-17-2012, 09:24 AM   #5 (permalink)
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subaru cats are very very good and last a long time. most all subarus go to their deaths with factory cats.

ther are lots of other things that will cause poor gas mileage before the cats will. and i think ''clogged'' cats will cause a power, bogging down, problem. so look somewhere else, cheaper, first.

i would start with a tune up, NGK plugs and subaru, or really high quality wires. plus oil , air filters.

knock sensor will cause the mpg to plummet and it will do this before it throws a code. but if left un-addressed long enough it will eventually throw a code.

o2 sensors can get old and cause bad mpg, before they throw a code. and these are cat related. the front one needs to be a subaru product, the rear one can be generic.

do you have any trouble codes? is the CEL on?

what makes you think your cat is clogged?
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Old 03-17-2012, 09:27 AM   #6 (permalink)
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Yeah, 18 is pretty low.

FWIW, my father's '98 Limited auto will do 30 MPG on the highway (probably a constant 55 or 60 knowing the way he drives) and does low 20s for city driving in the summer.

Even my H6 does better than 18 all the time.
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