Most likely this is due to time and not mileage. The oil life also counts days, its around 18 months for the life of the oil so if the oil has not been changed and the car was made about 6 months ago then this is normal. Only on a Volt is the time also a factor in the oil life.
The oil life meter in the Volt takes both usage and age into consideration. Even if the car has no miles, it will eventually zero out oil life over 2 years. If it is at 65%, I am assuming it was put in service about 8 months ago.
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