OSR rule for Consumables

I was breezing over the rules for The Front today, as I'm thinking of writing another scenario for the

system. Actually I was looking for a mechanism to hang a scenario on (that's a little tip for anyone wanting to get into scenario writing). I found my attention drawn to the "consumables" rule.

This rule is a way of tracking anything that can be "consumed", be that rations, bullets, grenades, or hot water. Its very handy for bullets, as in modern games tracking bullets-left can be terribly burdensome, way worse than arrow counting in your average fantasy game.

The core rule is that a consumable is allocated a die, for our example lets assume the players bullets are assigned a D6. After each round firing, the player rolls the consumable die. If he rolls a 1-2 then the die is reduced to the next smaller die, so in this case it would be exchanged to a D4. If you roll 102 on a D4 then that's it, you've run out of whatever it is. The assigned consumable die can be any of the standard polyhedrals, so the companies ammo supply might start with a D20 consumable. Then each time the company is engaged the referee can roll the die and reduce it through the all the dice 

D20 > D12 > D10 > D8 > D6 > D4

I think you could steal this rule and drag it back into fantasy games too. You could track arrows, oil flasks, food, water. Also if you want to stretch it a bit you could use the same mechanism to track the energy supply of a broken down horse the players are relying on. Its cool for this because everyone can see the die roll and will be bought into watching the bones slide across the table.