Questions: Do the fuel needs seem realistic, reasonable, balanced? Are there anyone who needs a new permanent fuel barrel (+1 fuel every turn) or any nations who need to get a fuel barrel removed from start?
@Frostion I have not played this map that much, unlike @Black_Elk. So what I say can be taken for a 'New' Player perspective. (Also I like digging around in the xml to see how other tackle their ideas.) So with that being said my thoughts on Fuel:
Most of the major powers (Germany, USSR, Britain, Japan, USA and Italy) could use a 50% increase in their start reserves. This IMOA would help move the game to the mid stages before Fuel became vital for these nations. Right now it feel like fuel is to important at the start of the game. Also I would increase the '1 Fuel-Barrel' to 2 or 3 in some places in Asia and Africa. It this was done then 10+ areas could be decreased a little. (Romania at 15 barrels represent half of Germanys production, and makes that area feel as if its more important the Berlin, and I feel like I need to reinforce there instead of expanding elsewhere.)
Denmark: I can see where @Black_Elk is coming from. The unit in the North Sea and Baltic Sea can not reinforce each other until one turn after Denmark's capture. The Russian fleet is not that big of a problem, but Britain can really hurt Germany. Maybe giving Germany Denmark and reducing the combined fleet by a Cruiser or Destroyer so that Britain is still problematic.
Anti-Air Gun: Allowing it to move during CM as changed the unit from a defensive orientated weapon to offensive fodder. So I can see the problem in costing it out. Maybe removing its CM capabilities while retaining its defense of 1, or treating it more like an artillery unit (2/3/1) with a cost of 15PUs. (The German's were very quick with emplacing the 88.)
Just some thoughts