CREATE TABLE table_8638 ("Driver" TEXT, "Team" TEXT, "Laps" FLOAT, "Time/Retired" TEXT, "Grid" FLOAT, "Points" FLOAT)

What was the highest grid for Patrick Carpentier?
SELECT MAX("Grid") FROM table_8638 WHERE "Driver" = 'patrick carpentier'
SELECT MAX("Grid") FROM "table_8638" WHERE "Driver" = 'patrick carpentier'