So what's the verdict? Is the Opel Blitz trucks better than OP's? By how much? I guess they also cost manpower upkeep?
This answer should be rather obvious, even the worst case scenario for the truck provides +1 fuel and +2 munitions every 20 sec, or +3 fuel and +6 munitions per minute. Compare to a fuel OP giving +3 fuel per minute or munitions OP giving +5 munitions per minute we can assign +1 fuel per minute a manpower value of 66.66 and 40 mp for munitions.
Worst case scenario:
+3 fuel/min = 200 mp
+6 munitions/min = 240 mp
200 + 240 - 200 = 240 mp more value for the same cost as an OP
We can extend this to the other more positive scenarios:
Munitions point but no fuel
+3 fuel/min = 200 mp
+18 munitions/min = 720 mp
200 + 720 - 200 = 720 mp surplus
Fuel point but no munitions
+9 fuel/min = 600 mp
+6 munitions/min = 240 mp
600 + 240 - 200 = 640 mp surplus
Munitions and fuel point
+9 fuel/min = 600 mp
+18 munitions/min = 720 mp
600 + 720 - 200 = 1120 mp surplus
So to clarify: in the best case scenario which is quite most likely (you often control both 1 fuel and 1 munitions point in a equal match up) you get a 1120 mp surplus from using a Opel blitz compared to a OP. Or in other words, you would need 1120/200 = 5,6 plus one so a total of 6.6 OPs (1320 manpower worth) to match the resource production of one Opel blitz with OPs.
So give you an example, let's say you get get out two Opel blitzes with the best case scenario, you would have to construct 13.2 OPs or 2640 manpower worth to get the same resource production. Unfortunately there's not even that many viable OP points on the map. Let's assume you don't own a fuel nor munitions point, you still need to spend 880 manpower on OPs to match 400 manpower on Opel Blitzes.
Verdict: Opel Blitz is THE shit. Never ever construct an OP with that commander.