We can't prove that Naruto have ftg, but he have something better then ftg. Because he can travel such distance almost instant. For ftg you need some preparations and maybe your oponent could read your intentions. Narutos foot speed>ftg.
You can't prove that. Whenever he used Kurama's chakra he had some signs .Or he uses Kurama's chakra as his own for speed without deploying the cloak ?