The production cost for SR+ and SR should be very similar. The SR+ has more range, 12-way power seats, better sound system, LED fog lamps. The SR+ is a much better deal than the SR. Most SR buyers should buy the SR+ ($37k). Some of them will also upgrade color, some will order autopilot and FSD. I estimate the ASP for SR and SR+ will be $40k. The ASP for non SR/SR+ will be $48k. Overall Model 3 ASP $43k, all-in cost $35k. If Tesla sell 400k Model 3 this year, the gross margin should be around $3.2B.
Next year, when Shanghai factory produce in volume, the cost for SR will drop at least $3k. FSD take rate will go higher after the car can handle traffic light and stop signs. I estimate in 2020 Model 3 ASP $45k, cost $33k. If Tesla sell 500k Model 3 in 2020, the gross margin should be around $6B.