Awesome app but one question

I love this app. The speakers are awesome and I can listen in the car.
However I noticed that since using it my data usage is skyrocketing. Is it because Im now addicted to constantly listening to the speakers when I cant be "in action"? Or would downloading the file allow me to listen without sucking up a lot of data?
Anybody knowing? Id greatly appreciate it.

Nathaniel Bumpo about 12 Steps Speakers