After this post, I pulled both air filters today at 14,702 miles.
I've been stuck in the low 14 MPG when I use to be in the mid 15's so I hope replacing the main air filter is what is needed a bit more often.
I'm planning to swap out both fuel filters at my next oil change simply to see how those look.
Wouldn't the intake tube (whatever it's called) past the filter be oily on the inside if that was blowback?
Mine was as clean as it could be.

The book says we only need to replace the pre-filter (foam) at 45,000 miles.
Now that I know what the foam filter looks like, I won't replace it as often.
There doesn't appear to be a need to.
It was still in decent shape, just full of dust particles if you hit it.
Possibly every other main filter change.

In my opinion, my main filter needed replacement.
Had several large bugs jammed in the pleats, under and stuck to the sides plus the dirt.

Factory main air filter





Factory pre-air filter




New filters - batch one



New foam filter.
Make sure the foam slit is matched with the plastic.
Make sure the foam is formed to the corners.