Oil Upkeep Discount

[JorMallester]

Hello all!

Just a quick question!

Reading the manual, I see that any units with 'oil upkeep' on a hex with a map supply level of 9 do not suffer from their oil upkeep cost; the idea being they get their oil directly from the train etc.

I also see that Land/Air/Naval Units in ports essentially receive a 1/3 discount to their oil upkeep ( if I am understanding this correctly )

This led me to look at the map, where in turn I checked out the map supply level of ports. From what I see, all ports have a map supply level of 9. ( I may have unfortunately missed any that don't. ) Do map supply level of ports reduce after invasions? ( I have not tested this yet. )

Essentially, am I correct in saying that as long as a unit ( including naval units ) is on a map supply level of 9 ( which appears to include all ports ) there is no oil upkeep to consider for any relevant unit(s) at all?

I'm sorry if this sounded long winded and such. Just trying to get a proper grasp of things. Thanks everyone!

Edit: Some of the info I am referring to can be found on pages 22 and 68 of the manual.

[AlvaroSousa]

Naval groups in a port take 1/10th the oil upkeep. So if a fleet says 10 oil use it really only uses 1 in port.

Any land or air units on a 9 map supply hex doesn't use oil at all. Like you said the supply comes right off the trains.

Ports need 1 turn to generate supply for an invader. So if you invade in turn 1, it will be a supply port in turn 2. On turn 1 you can't move any units into the port either.