CREATE TABLE table_203_271 (id DECIMAL, "date" TEXT, "series" TEXT, "circuit" TEXT, "city / state" TEXT, "winner" TEXT, "team" TEXT, "car" TEXT, "report" TEXT)

which model of car won the most races in the 1992 season ?
SELECT "car" FROM table_203_271 GROUP BY "car" ORDER BY COUNT(*) DESC LIMIT 1
SELECT "car" FROM "table_203_271" GROUP BY "car" ORDER BY COUNT(*) DESC NULLS LAST LIMIT 1