In my first winter with my Gen 1 Volt I saw a massive drop in range--to about 28 EV miles from 48 in the summer. Reading some other helpful posts here about winter tips and trial-and-error, I got back up to 38 (the EPA rating) for most of the winter.
I need maximum EV range as my round-trip commute is 56 miles with no charging at work. Of course, the Volt has a gas engine and you could not worry about it and drive normally. Some people just accept that they'll burn more gas in the winter and "make up" for it in the warmer months with exceptional range. Other people--like me--squeeze out as much as they can. Learning the best use of ERDTT, hold mode, heating settings, pre-conditioning, etc. made me able to do a good job with my Gen 1. For me, using the gas engine early in the trip and not electricity to heat helped restore a lot of EV range. You can actually get heat in "fan only" mode once the engine is warm and waste heat will last for a while even if you switch back to electric.
Good luck with what you decide to do.