User blog comment:Berserkchart486/Chakra Levels!/@comment-25152698-20151006111929/@comment-4869113-20151006180600

Gaara, as a jinchuriki, inherited the stamina of his beast. The fact that after his battle with Kimmimaro he was exhausted, and within the last seconds, Kimmimaro still had the ability to continue, shows that his reserves were comparably larger, or that he just had some outstanding chakra control to retain power.