2015 P.S. Vibrations

[louisianashooter]

Was driving tonight at 50 mph truck was in 6th gear. I started to notice a bouncing vibration, almost felt harmonic. Looked at the gauge cluster noticed the instant mpg gauge was like 1-2mpg. Lowered the volume of my music and heard a clunk noise I hit the brakes then it suddenly stopped. Anyone have any ideas? Just hit 5000 miles have not changed the oil yet.

 

[Spatel23]

may have been in regen from your mpg
not sure if it feels harmonic, I dont remember ever doing a regen lol

 

[WHY NOT]

Stuck brake caliper possibly. A regen won't drag milage down that bad or cause bucking.