You mean the US. The best selling vehicles in the world are Toyota Corolla, Ford Focus and VW Golf.
Assuming global F-150 sales are 700k, the F-150 is also beat by Hyundai Elantra, Toyota Camry, Wuling Hung Guang, Honda CR-V and Cheverolet Cruze.
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It isn't halfway to expiring. It's only about a third of the way there. At the end of the year cumulative sales should be somewhere around 60-65k in the US and the incentive expires at 200k. Plus there's a phase out over about a year. There was a discussion about it here:
Will the Model 3 be Ludicrously Fast? - Page 9