Tesla has no dealers. Their margins include the cost of sales, their Tesla stores.You wish. Tesla's margin is subtracting from final MSRP, whereas other manufafturers' margins are subtracting from the price at which they sell to their dealers, which is ~90% of MSRP. So, you need to subtract the cost of running their sales and service centers and marketing costs (like referral prizes, quarter end discounts, etc.) from the 20% margin Tesla brags about.
Bob Wilson