You didn't pay much, the real cost is how much more you have to put into it. You might get lucky, some old Volvos keep going, some are money pits, like my 79 240.
Paid only 500.00. They are pigs on gas, and the aluminum open fuses can short out, mine was the same manual shifter. Hitting that button is fun though...
and a wagon is 1000 times more useful than the sedan. If not rusty, you probably got a good car worth putting a few repairs into.
*Okay, pigs on gas may be a bit harsh
They are a mid sized solid heavy comfortable car, so of course should not be expected to get Civic mileage. Mine got probably the mileage of a slightly newer V6. Gas mileage is all relative; you have the space of a minivan in that wagon, more probably...