First gen Honda Odyssey had a 2.2L 4 cylinder, rated for 26 MPG hwy. Mazda5 also has a 4 cylinder, and can be had as a manual, rated at 28 MPG hwy. I bet with aeromods either one could get into the mid to high 30's. Or swap an Insight drivetrain into the Odyssey...
Civic wagons (the 2WD ones) look like they can be incredibly economical. Not sure how big you need the car for traveling.
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1992 Civic VX
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