The Corolla weighs almost 200 pounds less and has a 0.30 drag coefficient versus the 0.33 drag of the Vibe, so it should better if driven the same.
Why not inflate the tires though? Just a few PSI can increase the MPG without making that much of a difference in ride quality.
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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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