CREATE TABLE table_76930 ("Rider" TEXT, "Bike" TEXT, "Laps" FLOAT, "Time" TEXT, "Grid" FLOAT)

What driver had the highest grid position with a time of +0.283?
SELECT MAX("Grid") FROM table_76930 WHERE "Time" = '+0.283'
SELECT MAX("Grid") FROM "table_76930" WHERE "Time" = '+0.283'