M3 up to 353, dam that's impressive. So the question is, how did they do that?
For the model 3, all around it got newer wheel designs which have less drag.
Panasonic has been supplying a more energy dense battery cell in the current size. Also uses less cobalt (we will see how this affects long term durability in 5-10years i guess).
Improvements in castings have reduced weight.
Center console change allowed for some internal climate parts redesign which are supposed to improve efficiency there while also cutting down on the musty smell people have in some cars.
In the land of the model Y it already had the better castings from day one and the wheels. So less of a gain just due to battery cell improvements.
People keep saying model 3 heatpump but at this point it isnt there. Within a week or 2 we will have more people pulling them open but the one from earlier in the week said it wasnt there.