Toyota Motor Corp. reportedly has improved the fuel efficiency of its Prius gas-electric hybrid model in Japan from 68 mpg (3.5L/100 km) to 73 mpg (3.2L/100 km), bettering Honda’s Motor Co. Ltd.’s Civic hybrid, which gets 69 mph (3.4L/100 km) under Japanese test cycles. Although this new certification makes the Prius the most fuel-efficient 5-seat car available in Japan, Honda’s Insight 2-seater is the most fuel-efficient vehicle overall, rated at 82 mpg (2.9L/100 km). U.S. government ...

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