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Aero has significant impact. I notice this daily when comparing my old G1 Insight to my current Prius C.
The Prius C gets the same (if not better) fuel economy around town (probably due to the bypassed IMA on the Insight) but on the highway the Insight got a full 10+ mpg better. The Insight is aerodynamically shaped with a 0.25 cD while the Prius C has a worse 0.28 and doesn't coast as well despite weighing ~700lbs more. My wife's old Volvo S60 also has a cD of 0.28 but coasted just as well as the Insight, but the Volvo weighed almost twice what the Insight did so there was more kinetic energy available while coasting.
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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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