Hmm.. apparently some individual choose to discredit the Tumbler as Batmobile however its was clearly mentioned in the movie, dvd, blu ray the making features and comments/identified by the director, producer and etc as a bat-mobile.
Batmobile (Bat = Batman) + (Mobile = a mechanical/device which takes one from point A to point B)
wich direct, producer etc etc have you seen? becaue on the movie, dvd and blu rays not one time was the word "batmobile" mentioned by those people!