As a relevant comparison, between today and yesterday's trips my Insight got 82.9 MPG driving on "normal" roads (flat + slight hills) and "only" 73.7 MPG through mountain passes. MPG was lower because I couldn't maintain lean burn for 80%-90% of the passes.
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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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