Howdy and welcome! Good to hear new found Volvo enthusiasm still lasts.. Of course, we all knew that already.
As for mileage... they are all about the same. It's really going to depend more on an individual car's state of tune, performance modifications, air pressure in the tires, and driving style.
The wagons are probably a bit worse than sedans just for thier higher rear end gear ratio. If you can find one with an overdrive, that helps significantly... both wagons and sedans.
A stock 122 driven normally would fall in the 25mpg plus or minus range. The same car with an overdrive would probably get well over 30 on the highway.
A modified car with an overbored engine, weber carbs... and the like. Driven by a madman... I've gotten as low as about 8mpg. maybe a bit less. THough that is a 140, it all about the same.
Hope you find a good one and stick around to tell us about it!
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-Matt '70 145s, '65 1800s, '66 122s wagon, others inc. '53 XK120 FHC
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