YOU SAID:
our cars are the fastest
INTO JAPANESE
私たちの車は最も速い
BACK INTO ENGLISH
Our car is the fastest
INTO JAPANESE
私たちの車は最速です
BACK INTO ENGLISH
Our car is the fastest.
INTO JAPANESE
私たちの車は一番速い。
BACK INTO ENGLISH
Our car is the fastest.
That didn't even make that much sense in English.