I'm sure others will chime in, but running the battery dry in normal versus forcing the ICE on in hold will not impact the mpg/efficiency of the ICE. There may be some benefit to using mountain mode if you anticipate seriously hilly terrain, but I'm betting any effects will be negligible.
ICE mode efficiency
Driving my 2017 for the first time on a long trip requiring gasoline I wondered if I wanted to get the most mpg out of my gasoline should I be in normal mode or hold. I realize hold is normally used to save battery for city driving later but if that is not a constraint which mode gives best use of gasoline at highway speeds and why?
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