And 135 fuel SU-85 loses to 90 fuel StuG.
Not entirely true. SU-85s have range and can self spot. That can just as easily translate to an SU-85 killing a StuG and taking 0 damage.
230 fuel Pershing loses to 175/200 fuel panther.
This isn't exactly a good thing. The Pershing has been a lame duck since it was implemented. It's one of, if not the, least cost efficient tank for fighting other tanks. But at least it hurts infantry well and it's still got the range and damage per shot. I don't think that reality gives much weight to the argument.
AEC loses to a pair of 222, which cost over 50% less fuel and similar menpower.
The 222s are problematic indeed. They got too much health for also getting their 2mm gun. And again, this is a problem in and of itself, which doesn't lend itself well to addressing why or why not OKW fuel costs could/should be adjusted.
Your point?
I think it is that there's been plenty of adjustments to OKW that their unit costs might warrant a looking at. I think it is a valid point, at least as far as the P4 is concerned. However, it's also worth knowing that all the factions could use a bit of continued adjustments given the amount and kinds of changes this game as seen. (I'm looking at you Ostheer.)