Have the same problem on my EX- the exact same noise as the original video. But I *DO* know where the noise is coming from. I was able to park the car with it in idle and check out the exterior.
It was obvious that the noise was coming from the rear bumper. I would put my hand on the right rear...
In practical driving (45-55mph on the highway is not practical), I've averaged the following highway mpg:
65mph gets me around 47mpg
70mph gets me 44mpg
75mph gets me 39mpg
I cruise at 70mph cuz I just can't do 65mph for an 85 mile commute.