1989 Volvo 240 wagon.
Details: Sven - Volvo 240 wagon (sent to crusher) - 1989 Volvo 240 wagon Fuel Economy - EcoModder.com
It was my first ecomodding project car.
I gave it an electric radiator fan, front belly pan, upped the tire pressure, and built a Kamm back that was on for a month or two.
I did have it up around 29-30 mpg for part of a summer. But there's only so much you can do with a 3000 lb. rolling box with auto 4-speed transmission. I kept it for hauling big stuff until it finally needed too many things fixed. Drive train was still working great though when junked at something like 350K miles, typical for the old rear-drive Volvos.