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No, GM says to do so would require hardware and software changes. One member claims he can do it with his laptop connected to the car. It's not confirmed, the jury is still out.
 

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Welcome to the club! Other 2011-2012 members use mountain mode as a "modified" hold mode. It will keep the charge to around 1/3 or so remaining of your normal usage. It's not as helpful as a hold mode that will sustain the charge at any other times you choose, but it may provide some usefulness on a longer trip where you expect that perhaps your last 1/3 of the miles will be at lower speeds. You can select "Mountain Mode" when you have about 1/3 or so left and the Volt will "hold" the charge. You can then switch to "Normal" when you want to go back to CD mode. I would invite the early adopters to weigh in on the best use of it as I bought the first year, 2013, that hold mode was available.
 

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On my 2013 I have used mountain as a poor mans hold mode when I am too lazy to monitor battery level on long trips.

Key is to engage mountain right away and then disengage so you use up battery miles before your done.

Good Luck
 

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Nope. What I do for long trips that I know are going to use lots of gas is put it in mountain mode right away. That way you at least have 12-13 miles of electric range at the end if you want it.
 
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