We have a 2000 Outback, with 170k on it and in need of a tune up we get about 21-24 mpg, mostly highway miles. Fueleconomy.gov i believe lists it at 21city and 27 highway for mileage.
Specs says 18 miles per gallon in the city and 24 miles per gallon on the highway. My Subaru Outback 2003 VDC makes 18.5 miles per gallon in suburban driving, which involves some highway divining but much more 'city' type driving with many stops and much lower speeds (meaning less then optimal speed for fuel efficiency).
2.8 mpg if your luckey
The new catalytic converter and gasket for my 2005 outback wagon was $830 installed at an independent Subaru specialist. Are you sure that yours is not covered under warranty (80,000 miles, I think)
Take the distance traveled (X) and divide by the mpg (30)
My 86' Subaru GL wagon has 217,900 miles on it and is still running strong!
105,000 miles
The EPA range estimate for the 2010 Subaru Outback is 351.5 mi. in the city, 499.5 mi. on the highway.
The EPA range estimate for the 2014 Subaru Outback is 388.5 mi. in the city, 518.0 mi. on the highway.
The EPA range estimate for the 2002 Subaru Outback is 321.1 mi. in the city, 422.5 mi. on the highway.
The EPA range estimate for the 2011 Subaru Outback is 351.5 mi. in the city, 499.5 mi. on the highway.
The EPA range estimate for the 2006 Subaru Outback is 338.0 mi. in the city, 439.4 mi. on the highway.
The EPA range estimate for the 2005 Subaru Outback is 338.0 mi. in the city, 439.4 mi. on the highway.