SELECT COUNT(dirty_electric_grid_rocky_mountains__denver_) FROM table_23840623_4 WHERE epa_rated_combined_fuel_economy = "102 mpg-e (33kW-hrs/100mi)"
Berapa banyak kendaraan Dirty Electric Grid Rocky Mountains (Denver) yang memiliki EPA dengan peringkat penghematan bahan bakar gabungan 102 mpg-E (33kW-jam/100mi)?
CREATE TABLE table_23840623_4 (dirty_electric_grid_rocky_mountains__denver_ VARCHAR, epa_rated_combined_fuel_economy VARCHAR)