CW46k

I have a 2007 Legacy Wagon and my mileage has been dropping over the past year. 26-27 Hwy when it was getting 30+ mpg. Here's what worked for me. A $10 can of Mass Airflow Sensor (MAF) cleaner! 10-15 minutes to remove the electrical connector and two screws. Mine was right near the air filter. I sprayed the *#$%^ out of it (inside the tube and out) and cleaned it all gently with a Q-Tip. I just got back from a road trip to Boston (400-500 mi RT) and got a solid 30+MPG again. My local mileage is still a little off, but it's cold with winter gas so that's not unexpected. Look up some videos for cleaning yours. I also had the option of buying a new MAF for $40-$50, but opted for the cleaner first. I was also a little miffed that Subaru never checked this since I've asked them to check my mileage twice! Try checking yours. It's a palce to start that won't break the bank! Good luck. CW46k