So... is F finished or not?
NO, it is not finished.
Why?
The anime finished before the manga:
Anime finished: December 23, 1988
Manga finished: August 03, 1992
MangaUpdates contains information about the anime adaptation and indicates that it is incomplete.
Watching Order (by release date)
Here you have all the anime relations we detected ordered by release date, so you can see the reason for this status in context and also use it as watching order.
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Synopsis
F tells the story of Gunma Akagi, a spirited young man from a rural setting known for his reckless driving of a turbocharged tractor. His father, a politician with ambitions, is constantly trying to keep him in check.
Gunma's life takes an unexpected turn when he encounters a much faster car on the highway. Humiliated by his defeat, he develops an intense desire to surpass this unknown driver.
Driven by his newfound ambition, Gunma leaves his quiet life behind and ventures into the city. His goal is to become a Formula One racer, pitting his skills against the best and proving himself on the world stage.