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recently (past 4-5 fillups), i have noticed very very poor gas mileage. when calculated out i have been getting 16-18 mpg, when previously i was consistently getting 21-23 mpg. i usually use midgrade (87 octane), and have tried using premium (91) the last fillup to try and... Read More

• Have you checked your Air Filter? that can be a huge thing for killing your gas mileage and performance. If you're not throwing any CELs you shouldnt have any serious problems. Also check to see how long you've had your current spark plugs in, that will help your car run a bit better too. Reference:Personal Experience Read More
• What else has changed? Are you driving harder? Higher octane fuel will not help your MPG. Driving habits have a large impact on MPG, driving in town more? More stop and go? A tune up is probably in order if you haven't done one yet. That involves PVC valve, air filter, spark plugs and wires and fuel filter (read your... Read More
• When is your last time to have the car tune up? Also, when you get lower mileage, are you driving with other heavy equpment in your wagon spaces? A 100-lb in the wagon will make 2-3 mpg less than empty space. Also, try BG 44K (the fuel injector cleaner) and make sure you get a good oil change.
• See if it is time to change your oil. Subarus will show a definite decrease in gas mileage as you approach the time for an oil change. I've owned Subarus for years and have noticed this on every single one.
• Change the air filter, the oil and replace the spark plugs

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