This doesn't jive with my experience. I precondition unplugged in 45F mornings with my HVAC set for 74F, fan speed at "1", and air routed to the feet and windows. I thoroughly enjoy the 20min preheat (much better than the Volt, which only had 10 min preheat increments) increment of the Bolt and only notice maybe 5-10 miles of range lost (so 2-5%). Far from 20% of my total energy usage.Note that the Usage Score for the Climate Control slider immediately goes to -5 if you ever turn on the heat. Also, if you preheat without being plugged in, even for a few minutes each time, you can easily chew up 20% of your total energy consumption.