CREATE TABLE table_27014 ("Vehicle" CLOB, "Operating mode" CLOB, "EPA rated All-electric range" CLOB, "EPA rated combined fuel economy" CLOB, "Clean electric grid California  ( San Francisco ) " CLOB, "U.S. national average electric mix" CLOB, "Dirty electric grid Rocky Mountains  ( Denver ) " CLOB)

When 87 mpg-e (39kw-hrs/100mi) is the epa rated combined fuel economy how many operating modes are there?
SELECT COUNT("Operating mode") FROM table_27014 WHERE "EPA rated combined fuel economy" = '87 mpg-e (39kW-hrs/100mi)'
SELECT COUNT("Operating mode") FROM "table_27014" WHERE "EPA rated combined fuel economy" = '87 mpg-e (39kW-hrs/100mi)'