However, if I put in Xihe in the search box from my start point, it does only say it is 67 LY away. I am now assuming this is a 'as the crow flies' straight shot measurment, which probably explains why I didn't see the Crazy Mad Money upon my return. I was hoping for a bit more than 500-1K per ton though, but oh well.
I call shenanigans on the distance formulas and tables, with all due respect to the people doing the maths. I've had to travel close to 280 LY on one run (yes, "as the space crow flies") to get any price increase at all (it was ~800 CR the entire way, then poof! 18K/ton).
The only reliable one I've found yet is the Ethgreze <-> Toxandji route which gives payback on both ends. Ofc, you need to wait to fill up if you're in anything bigger than a Cobra.