My 2012 Volt is rated for 35 miles on a full charge in EV mode
It has over 50k miles on it and I drive it in EV mode at least 38 miles every day, with many miles left in reserve (usually 7-10 miles of range remaining). I've driven it almost 45 miles at a time on many occasions.
I have yet to use any gas on my daily commute! Eventually the car is going to make me burn the tank of gas I have in it just so it doesn't go stale, but the car is turning out to be exactly what I needed.
I like the fact that the Volt limits charge and discharge and it that the big battery is liquid cooled, with its own cooling and heating system so the battery never has to see any extremes. I have a feeling I'm going to see many, many miles before I notice any signs of it degrading
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