Well, it's also been advertised as a WESTERN yet it takes place in 1963.
To me, a western is pre-automobile.
Where would that put Sam Peckinpah's best Westerns (Ride the Hight Country, The Wild Bunch, Ballad of Cable Hogue), where the automobile is an important symbol of the passing of the old West? And hey, what about Roy Rogers and his trusty jeep? :-)