2025 Ram Laramie 1500 3.0 with 5000 miles. With front wheels off the ground my front axles rotate with the same feel when in 4wd auto as they do when in 4wd. When in 2wd they rotate freely with no feel of being engaged, I thought 4wd auto and 2wd should feel the same unless it senses loss of traction with the rears and then the fronts would engage. My gas mileage seems to be way down currently around 11.5 mpg. Am I wrong about this situation?