Although I think the incremental cost maybe low in your calculation, it could just be about whether its 3.5% or 3.0% increase on GM, so not important. But one word of caution on the eps estimate, I think a big chunk of revenue of AP2.0 cannot be recognized next Q because the software is not ready yet. Tesla defers revenue like this that are not fully recognized at the time of sale. Quoting latest 10-Q
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We recognize revenue for products and services when: (i) a persuasive evidence of an arrangement exists; (ii) delivery has occurred and there are no uncertainties regarding customer acceptance; (iii) pricing or fees are fixed or determinable; and (iv) collection is reasonably assured.
Vehicle sales include standard features, customer selected options and accessories, and specific other elements that meet the definition of a deliverable under multiple-element accounting guidance including free internet connectivity, free access to our Supercharger network, and free future over the air software updates. These deliverables are valued on a stand-alone basis and we recognize their revenue over our performance period, which is generally the eight-year life of the vehicle, except for internet connectivity which is over the free four year period. If we sell a deliverable separately, we use that pricing to determine its fair value; otherwise, we use our best estimated selling price by considering costs used to develop and deliver the service, third party pricing of similar options, and other information which may be available.
As of June 30, 2016, we had deferred $55.9 million, $66.1 million, $42.0 million, and $3.7 million related to the purchase of vehicle maintenance and service plans, access to our Supercharger network, internet connectivity, and future software updates, respectively. As of December 31, 2015, we had deferred $53.6 million, $49.5 million, $32.4 million, and $2.7 million related to these same performance obligations, respectively.
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The deferred revenue from future software updates here is small because there's not a lot of value not delivered back then. Now with the significant increase in price and absence of the software to make it work, I think the deferred revenue would be quite high.
However, this won't affect cash flow, which I think is more important than eps at this stage.