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Too much EV range???

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Hi Volt community. I got my 2014 metallic silver volt from Carvana about a month ago. I am obsessed. I love this car. I have noticed that after a full charge, the electric range keeps getting higher and higher. The car is rated to get 38 miles per full charge, but most recently it's showing 46 miles of range. This seems like a dream-come-true, but could it mean my battery is using too much of its capacity (which could lead to a shorter life span) or maybe the range is considering my previous drive style to calculate this range? Very confused!