What is the average year for Maserati Straight-4 Engines?
CREATE TABLE table_name_86 (year INTEGER, engine VARCHAR)
SELECT AVG(year) FROM table_name_86 WHERE engine = "maserati straight-4"
### Context: CREATE TABLE table_name_86 (year INTEGER, engine VARCHAR) ### Question: What is the average year for Maserati Straight-4 Engines? ### Answer: SELECT AVG(year) FROM table_name_86 WHERE engine = "maserati straight-4"