CREATE TABLE table_20549371_3 (vehicle VARCHAR, epa_rated_highway_fuel_economy VARCHAR)

What vehicle has an epa highway fuel economy of 109 mpg-e?
SELECT vehicle FROM table_20549371_3 WHERE epa_rated_highway_fuel_economy = "109 mpg-e"
SELECT "vehicle" FROM "table_20549371_3" WHERE "109 mpg-e" = "epa_rated_highway_fuel_economy"