Here's what I'd do: wait until the van's paid off, and there are a few used Mazda 5's on the market. Why Mazda 5? Because you can get it in a 5-speed, and even though (like most other manuals) it's geared to low for good FE on the highway, if you're a serious hypermiler, you simply can't beat a manual transmission.
Of course, I'm assuming both you and your wife would drive stick.
The 5 is rated city 22, hwy 27, but with the stick, you could kick butt on those numbers.
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