CREATE TABLE table_77901 ("Driver" TEXT, "Constructor" TEXT, "Laps" FLOAT, "Time/Retired" TEXT, "Grid" FLOAT)

What is the top grid that laps less than 66 and a retried engine?
SELECT MAX("Grid") FROM table_77901 WHERE "Time/Retired" = 'engine' AND "Laps" < '66'
SELECT MAX("Grid") FROM "table_77901" WHERE "Laps" < '66' AND "Time/Retired" = 'engine'