CREATE TABLE table_64320 ("Rider" TEXT, "Bike" TEXT, "Laps" FLOAT, "Time" TEXT, "Grid" FLOAT)

What is the highest grid that has gregorio lavilla as the rider?
SELECT MAX("Grid") FROM table_64320 WHERE "Rider" = 'gregorio lavilla'
SELECT MAX("Grid") FROM "table_64320" WHERE "Rider" = 'gregorio lavilla'