3-4 times that would be 7200-9600 calories a day, already more than your example of the Rock.
Regardless
> The point is there are people that are eating large fries and triple thick milkshakes as snacks driving from place to place because it makes them feel happy instead of just eating to feel full. And you just can't outrun that.
Yes, if you eat more calories than you expend, because you spend your time eating while driving, instead of exercising, you wont expend more calories than you consume.
That doesn't change the fact that a human can exercise enough that they have difficulty maintaining weight even after eating significantly more calories than necessary for normal maintenance weight.
Nothing about the human metabolism circumvents thermodynamics