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Here are some charts with 3 years of OnStar data. I use the OnStar diagnostic emails that I receive monthly. Temperature is the average daily temperature reported by the Capital Weather Gang from the Washington Post. For EV range I am using the kWh / 100 miles and dividing that by 1250.
I only drive locally and my driving style is basically unchanged in the last three years. I did start driving more efficiently the last two years and almost never use climate control so that has skewed the data in the last year, plus tires are now at 50 PSI compared to 42 PSI earlier in my Volt ownership.
These charts provide a pretty clear indication of the effect of temperature on EV range.
I only drive locally and my driving style is basically unchanged in the last three years. I did start driving more efficiently the last two years and almost never use climate control so that has skewed the data in the last year, plus tires are now at 50 PSI compared to 42 PSI earlier in my Volt ownership.
These charts provide a pretty clear indication of the effect of temperature on EV range.

