Fuel economy for the 2016 Prius from fueleconomy.gov is 54/ 50 mpgUS. 22.1 km/ L. 4.52L/ 100km.
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https://www.fueleconomy.gov/feg/noframes/37163.shtml
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You cannot go by the Japan test numbers. They are way too high an all cars. Especially for hybrids and plug in hybrids where they do not replenish the battery.