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2 in the trunk and 2 in the back seat
Bring something to wrap the tires, like a blanket, to protect your seat.
I’ve crammed four tires in a Mini Cooper coupe which is like half the size of a Model 3, you’ll have no issues.
These are 19" Geminis for Model Y. They fit.
I used like a whole blanket/painter tarp, second row back seat upright. Had front seats all the way forward then adjust back to keep the tires from moving.
One in middle, the slanted on each side. One in trunk.
Mind the headliner - it will stain if the tires rub.