SELECT COUNT(operating_mode) FROM table_24620684_2 WHERE epa_rated_combined_fuel_economy = "87 mpg-e (39kW-hrs/100mi)"
Ketika 87 mpg-E (39kW-jam/100mi) Apakah EPA dinilai Ekonomi Bahan Bakar Gabungan Berapa banyak mode operasi yang ada?
CREATE TABLE table_24620684_2 (operating_mode VARCHAR, epa_rated_combined_fuel_economy VARCHAR)