It's a three-syllable word.
The spelling and pronunciation should be no mistake…"national" — not "nashnle".
"It's revolting to hear this word mispronounced — reduced to two syllables — especially by a snooty-sounding Brit spokesman for a car-rental brand.
If somebody wants to butcher our English words, that comes with freedom, I suppose. But hearing a major corporation approving the butchery and supporting it with millions of advertising dollars is unconscionable. Let's leave their cars on the rental lot!