Each unit requires 1 IPC maintance at the start of a player's turn.
I'm experimenting with something similar... logistics;
To conduct attacks you need supply tokens - and luckily the Bulge game made plenty! I'm also looking at what penatlies come from not having supply in defence - perhaps tanks defend at '2' - and planes need to expend 1 supply per area that they interecept from, otherwise no defensive support.
Still playing with cost - 1IPC per supply, or 1IPC per five supply?
Should it be one supply per area - or one supply per 5 units?
Or what about supply is only needed to make artillery give infantry the '2' attack rating, or allows planes to make tanks attack a '4' on the one to one basis mentioned in the Blitzkrieg NA.
Or will they just slow the game down... I sort of wanted to make building up supply tokens part of preparing for a large offensive, and move away from everyone attacking with every area each turn - so that you get some forced concentration of aim - it's too expensive to attack everywhere and see what opportunities open up.
Still toying with this, and will demo it over Christmas with some friends... we just want to use the trucks and supply tokens and have the problems associated with the historical problems of not being able sustain both Patton's and Monty's advance!
Supplies can be drawn from adjacent areas, can be moved on trucks or ships counting as one land unit... necessary for amphibious assaults, naval interception, defensive air support - conducting strategic bombing raid.
I'm open to suggestions.... (or slap downs!