Well, you could just ditch and respawn with a full tank.
Making it impossinle to ditch, now that would be a feat. Then you could have that scenario going on. Maybe even a battle over fuel dumps. How about there is a set amount of fuel output, and if you bring the gas back, you get to put it back in the resivoir.
For instance:
There are 300,000 gallons of fuel availible, increasing at a rate of 500 gallons per minute. This is how much the country as a whole has. Wether you get your hands on it is a different question. If a base is cut off, so is its fuel supplies. You would have only so many gallons before you would run out.
This chain would eminate from fuel strats. If you could encircle the strat, you could literally strangle your opponent into submission. Now one may say, you could just wreck a country by upping a B-17 and bailing repeatedly on the runway. Disable that. A personal allowance could be had.
Amount of fuel at field
Allowance= _______________________
Number of players at field
Each field would recieve fuel at a set rate, meaning that it would not instantly recover its stocks. It would fill until full, at which point the next base would get it, and so on and so forth. The "pipes" would flow like GV spawns, if none are present, on would flow in from the nearest base.
This system would encourage deep bomber raids, add realism, and prevent spies from getting that much effect against the other side.
-Penguin