I have a 2006 prius (so the 1.5L engine) and get around 800km to a tank (43L). I drive into Christchurch daily and consequently do a 50/50 mixture of open road and city driving which works out to be an average of 5.4L per 100km. As to 200 - 300 km of highway driving exclusively I've never paid particular notice to what my figures would be on longer trips but if I get these will pass on.
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