Ahaha, is everyone still claiming it's not a big car...
As are all GT cars then:
So - the Mustang: Width (inc mirrors) 2080mm. But then, the Mercedes SL is 2099mm. The BMW 6 coupe is 2090mm. The new Mondeo 2121mm Etc. All GT/Saloons.
So it is really a rather pointless point to make, it is no bigger than other GT's, hey its smaller than the latest Mondeo, just the way its proportioned makes it look big but last time I checked this is a muscle car, its supposed to have a huge hood, sorry bonnet.
But to say its gigantic is fine if the other GT's from BMW, Mercedes are also classed as gigantic considering they are actually wider than the Mustang.