-30 isnt really even challenging for a gasoline car, you would need -60 or more for gasoline to become thick enough to be a concern. More likely at that temperature is your battery being unable to turn your engine over to try and start it and might require a jump to get turning over. Diesels may struggle at that temperature, buts its a known issue that northerners add anti-gelling additives and/or block heaters for. Of course an EV can and should have built in battery heaters for that too.