That logic does make sense if we assume that the purchase price of a vehicle is entirely for the battery and all other parts of the car are free.

Nonetheless, even if we accept your logic, your point remains a weird one. The vehicle with a 88 kWh "usable" capacity goes a little bit further on the highway compared to the vehicle with a 73 kWh "usable" capacity. Is this supposed to be a surprise to anyone?

My point was about efficiency, not range. Range can easily be made higher by putting in a bigger battery, which is precisely what Ford did here. Quoting from your own citation: "Keep in mind that the Tesla Model Y is more efficient than the Mach E but it has a smaller battery." That was my point. You're making another point and I'm not disagreeing with it.