Just test drove a 2017 Volt and not sure if I should purchase or wait for my Bolt EV to come in during 2018 (?) Or wait for new 2018 Leaf to be announced. To help me decide, need to know what sort of winter battery only range I should expect - in Ottawa they say summer range is 85KM but what about January range on those -10 to -20 Celsius temperature days. The sales Rep told me today the range will be the same on battery. Is that true?