Here is my entire empire:

All supply lines green, almost all units in black. I'm low on oil, but have more coming on line. Moreover, I can't tell how much oil is being used per turn, by what. Low on food, but also have more food coming online. Why is everyone out of supply?
I'm RTFM now, but it is a slog. Also watching DasTactic's videos but haven't gotten to the logistics part yet!

