select max(mpg) from cars_data where cylinders  =  8 or year  <  1980
What is the maximum miles per gallon of the car with 8 cylinders or produced before 1980 ?
select max ( mpg ) from cars_data where cylinders = 8 or year < 1980
select max ( mpg ) from cars_data where cylinders = value or year < value
What is the maximum miles per gallon of the car with 8 cylinders or produced before 1980 ?