I think that rule is stupid. They will save what? 230k per weekend, thats 5.3mil per season, and teams spend 135mil per season. Is that 5 mil that teams save really that important? If they really wanted to save enviroment and be "carbon neutral" they would at least try to make number of races smaller and calendar more enviroment friendly, this blanket bullshit is just PR.
Exactly, the calendar is absolutely insane, fix the damn logistics that not only are far from efficient from an environmental standpoint - that has to take a toll on the teams and the personnel and I believe we're getting, step by step, closer to them saying ok enough
Well you need a lot of energy to keep tires hot, also I think that they need to heat tires 1-2h before sessions (not sure about this) and also whole session, so those blankets are turned on a lot of time during the weekend.