If you're going for cheap, my old '86 Ranger (2.3L, 5 speed) easily got 24 mpg freeway. You could also look at the early wagovans, like the Colt Vista and Civic lunchbox. Also, I noticed that for 1994 at least, the Ford Aerostar was available with a 3.0L and 5-speed that was good for 23 mpg freeway.
I have to agree on the Astro: my employer had a '94 (back in 2000), and it had a nice setup, with cabinets and a work surface built in the back, powered by a couple of batteries and an inverter on the floor. However, it got about 16 mpg under my foot and was scary as hell above about 70 mph.
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