That 140 miles ... British miles... so more like what 110 miles USA? 120?
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See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.
The seams look trunk-y, but it's a hatch similar to the Prius' and Volt's. You can see it opened in the gallery here: https://www.hyundaiusa.com/ioniq/
Good energy info on the screen breaks down the consumption to show climate control and electronics separately. Clean aero and coasts well. I wonder if it is a Perm magnet motor or induction?