CREATE TABLE table_51300 ("Driver" TEXT, "Constructor" TEXT, "Laps" FLOAT, "Time/Retired" TEXT, "Grid" FLOAT)

When the laps are over 53, what's the average grid?
SELECT AVG("Grid") FROM table_51300 WHERE "Laps" > '53'
SELECT AVG("Grid") FROM "table_51300" WHERE "Laps" > '53'