CREATE TABLE table_20090682_4 (vehicle VARCHAR, top_13_time VARCHAR)

how many vehicles where top 13 time is 1:18.72
SELECT COUNT(vehicle) FROM table_20090682_4 WHERE top_13_time = "1:18.72"
SELECT COUNT("vehicle") FROM "table_20090682_4" WHERE "1:18.72" = "top_13_time"