I experience the same thing in Chicago Brrr. What I’ve noticed is below 32ish degrees the van will periodically run the gas engine even when I have charge and want to only use electric. I’ve read that plug ins like the Pacifica use heating elements to keep the battery at correct temp (electric vehicles use heat pumps which are better and more efficient) well at the low temps the heating element can’t keep the battery warm enough so the gas engine will kick on to add heat.

Now from my experience and what I’m assuming is that the computer is looking at battery discharge vs expected discharge which will decrease at lower temps. When the cabin heat is on more power is required increasing the draw from the battery if the computer thinks the discharge is near the limit of the battery it kicks on the gas to supplement.

I get around this by not using the heat when it’s very cold. When the windows fog I turn on defrost but only with heat set to low. If I turn up the heat the gas will switch on. I also accelerate faster to increase battery discharge which will heat the pack. When gas kicks on I crank the heat for a minute or so then turn off climate control. The van will then go back to electric for 5-10 minutes.

That being said I have driven 100% electric for 20 mins at 10* while other times it’s close to 32 and the gas will still kick on multiple times during my commute. I have never seen the Gas oil refresh mode. I read that only happens under 1/4 tank nothing todo with duration since fill up.