CREATE TABLE table_58263 ("Driver" TEXT, "Constructor" TEXT, "Laps" FLOAT, "Time/Retired" TEXT, "Grid" FLOAT)

What is masten gregory's average lap?
SELECT AVG("Laps") FROM table_58263 WHERE "Driver" = 'masten gregory'
SELECT AVG("Laps") FROM "table_58263" WHERE "Driver" = 'masten gregory'