Hey fella, Well on paper the Carbon GT and the Bamboo GTX have the same battery power over the Bamboo GT which isn't as powerful, you will clearly get more range/longest battery power out of the Carbon and GTX. Between we are talking range there are so many factors that play into this, the riders weight, the terrain, the temperature, AT or ST set up, how fast or slow you are riding! all of these plus more will effect your distance.
If your riding in the fastest gear and going up and down a lot of hills, over grass and so on, then your total distance will be a lot shorter before your batt dies and you may only get about 10-14 miles range. If you riding in the lower gears and only on nice smooth flat surface then you could be out riding for hrs and getting upto 25-30 miles range..
Hope this answers your question bro and thanks for taking the time to comment..