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I have 2 850s that get the type of mileage you are talking about. And that from someone that logs every fill-up and maint item and can go back years with mpg numbers. Following are some rambling thoughts on the subject.
Both are non-turbos which makes a big difference. Generally speaking doin't turbos reduce mpg about 15-20%?
Both get oil changes, plugs, rotors, dist cap and simple maintenance here at home. More complicated, or stuff I don't have time for, they go to a good indy shop in the area that specializes in Volvo/Saab.
Also, we live in the country, so even when going to the city most of my miles are highway.
My best mileage is with a '94 wagon with 167,000 miles and a 5-speed standard transmission that gets a little over 30 mpg. Seems about 2 times a year that mpg will drop due to a caliper that is hung up just a little. The type of thing I would probably miss on a auto transmission. Our 'test' is to coast in neutral from the top of one of the local mountains, depending on how far you get you know how well the car just rolls. Caliper stuck, you stop several miles from the stop sign at the end. Everything fine, you make it to the stop sign.
My other 850 is a '93 with 267,000 miles and automatic transmission that hits 30 mpg on good days, but is usually about 28.5. Gained a little after flushing tranmission fluid. Also, seems to have gained after replacing radiator, but should a radiator really affect mpg?
Both will drop a little in mpg when the plugs have about 25-30k miles on them or need an oil change.
The wagon's check engine light came on with the low flow to the EGR valve and dropped in mpg. After cleaning mpg back up and performance better then I had been in a while. So yes I think EGR cleaning is helpful in mpg. (Also something I'll need to do better in future!)
Good luck!
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