The Volvo 240 would run forever as long as you keep fixing it. I knew several people who had them and a steady stream of relatively minor (but expensive) repairs was required to keep them going. That's most Volvos owners long since switched to Japanese cars.
The one exception I know is my father in law whose been driving Volvos since the 60's and now drives a 2005 S60. He has no trouble matching 11 L/100km around town and mid 7L/100 km on the hwy (2wd, non turbo). The transmission was replaced under warranty when it was 2 years old but has been fine since. Other then that it's been toublefree.
He still misses his 1995 850 most, roomier then S60, much nicer to drive then the 240 (and 140).