Table: t_1970_mexican_grand_prix
Columns: driver
constructor
laps
time_retired
grid

Question: What is the high lap total for françois cevert?
SQL: SELECT MAX("laps") FROM t_1970_mexican_grand_prix WHERE "driver" = 'françois cevert'

Question: Who constructed rolf stommelen's car?
SQL: SELECT "constructor" FROM t_1970_mexican_grand_prix WHERE "driver" = 'rolf stommelen'

Question: Who drive the car that retired due to engine failure and a grid of less than 9?
SQL: SELECT "driver" FROM t_1970_mexican_grand_prix WHERE "time_retired" = 'engine' AND "grid" < 9