Gas Mileage droping

Asked by Jul 05, 2011 at 12:14 AM about the 2000 Subaru Outback Base Wagon

Question type: Maintenance & Repair

First question, I had a tune up done last fall on my outback wagon, fluids flushed, fuel filter, spark plugs, etc.  ever since then the gas mileage has drop by about 100 miles per tank.  I was getting around 390-400 on as full tank, even in the city now I'm lucky if I get 290miles out of a full tank.  The car has about 208,000 miles on it now.  I've tried using fuel injector cleaners an the such but nothing is working.  What could the issue be and how do I fix it?

3 Answers


It could be a wide variety of things. Can you list everything done? It could be the distributor or coil packs starting to go. Or an oxygen sensor. If you start it up and stand behind the exhaust does it smell as if the car is running rich? If so it isn't burning the fuel properly. It could also be that you have a small fuel leak in a fuel hose. Inspect the fuel lines while your at it.

I had a complete tune up done, Spark plugs and wires replaced, all fluids flushed and filters replaced. There was a head gasket leak last year and half the engine was rebuilt including the timing and distributor cap. The transmission was rebuilt about a month ago. When I first start it every day it reves up to around 1700 rpm, gradually dropping to about 1000 rpm and then not going down to 700 rpm until I put it in gear. I had it check for a vacum leak and there are no codes that come up.


I had a much similar issue about a week ago. Apparently I broke some wires that are responsible for sensors during cold startup. My car would idle high and then drop to 1000 and when I put it in gear it was around 800. But it also would accelerate and stall on its own. I took it to the mechanic and he fixed it in under 10 minutes, wouldn't even let me pay him. Ur best bet is to just take it to a mechanic there's too many electrical parts to these cars.

Your Answer


Looking for a Used Outback in your area?

CarGurus has 38,482 nationwide Outback listings starting at $1,700.


Subaru Outback Experts

  • #1
  • #2
  • #3
View All

Related Models For Sale

Used Subaru Forester
310 Great Deals out of 36,267 listings starting at $999
Used Honda CR-V
617 Great Deals out of 67,193 listings starting at $1,800
Used Subaru Legacy
160 Great Deals out of 14,047 listings starting at $1,250
Used Subaru Impreza
177 Great Deals out of 21,057 listings starting at $1,333
Used Toyota RAV4
521 Great Deals out of 66,209 listings starting at $1,995
Used Toyota 4Runner
314 Great Deals out of 30,395 listings starting at $2,500
Used Toyota Highlander
477 Great Deals out of 44,975 listings starting at $1,750
Used Toyota Tacoma
445 Great Deals out of 41,056 listings starting at $2,600
Used Honda Accord
592 Great Deals out of 92,752 listings starting at $1,495
Used Jeep Grand Cherokee
800 Great Deals out of 73,393 listings starting at $950
Used Toyota Camry
890 Great Deals out of 73,115 listings starting at $1,400
Used Ford Escape
969 Great Deals out of 105,825 listings starting at $550

Used Cars For Sale

2018 Subaru Outback For Sale
11 Great Deals out of 27,599 listings starting at $22,881
2017 Subaru Outback For Sale
66 Great Deals out of 2,524 listings starting at $19,889
2016 Subaru Outback For Sale
56 Great Deals out of 1,290 listings starting at $13,980
2015 Subaru Outback For Sale
54 Great Deals out of 1,768 listings starting at $11,500
2014 Subaru Outback For Sale
31 Great Deals out of 943 listings starting at $7,451

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.