What kind of gearing does it have? The Sienna with the same engine has decently tall gearing (2000 RPM @ 70 MPH) and a good drag coefficient (0.30) and can get close to 30 on the highway, and low-mid 20s around town with no mods and without any extreme hypermiling. Bumping those FE numbers up shouldn't be too terribly difficult with a few mods.
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2013 Toyota Prius C 2 (my car)
2015 Mazda 3 iTouring Hatchback w/ Tech Package (wife's car)
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