Now that we have the official numbers from Tesla on the Model 3, here's a comparison chart of the two models. Interior space is very similar with the Model 3 ahead (no pun intended) on headroom for both the front and rear passengers, legroom is essentially the same - Model S rear is ¼" more, and the Model S width ends up being about ½" to ¾" more per passenger over the various measurements.
For the exterior numbers, these are about what we saw reported by MotorTrend's estimates last year (and Tesla's teaser earlier this year), however odd that their is a 8.9" difference on the S when the mirrors are folded and on the Model 3 the difference is only 4.1" - so not sure if there is some error in one set of numbers or the other or if the folding mechanism works differently - but they essentially appear that they should fold nearly the same (or if on one car they sit inside the hippy fenders more than the other possibly).
(WITH UPDATED WIDTH PER TESLA)
For the exterior numbers, these are about what we saw reported by MotorTrend's estimates last year (and Tesla's teaser earlier this year), however odd that their is a 8.9" difference on the S when the mirrors are folded and on the Model 3 the difference is only 4.1" - so not sure if there is some error in one set of numbers or the other or if the folding mechanism works differently - but they essentially appear that they should fold nearly the same (or if on one car they sit inside the hippy fenders more than the other possibly).
(WITH UPDATED WIDTH PER TESLA)