These are getting a little out of your age range, but your ideal vehicle would be one of these things they used to call “station wagons”. The last full-size station wagons you could buy were the Chevy Caprice/Buick Roadmasters. They’ll seat 8 easily, get into the mid-20’s gas mileage and are extremely reliable. I think the last year they sold them was 94’ or 96’… thanks to the first version of CAFE, which made it more attractive for automakers to sell SUV’s instead of station wagons.