I would think there would be need to be some tables for things like parts breaking, more or less fuel consumption, drivers falling asleep etc. There is no simple answer. Vehicles will already be running on duct tape and bailing wire, they probably can't run at there top speeds, and even brand new vehicles don't run at top speed all the time. With the table, the farther and faster you push, the more rolls for things to go bad.
I wouldn't worry much about crew fatigue. Anybody still alive in the year 2000 will be used to little sleep/rest and will be ready when the bullets start flying.
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If you run out of fuel, become a pillbox.
If you run out of ammo, become a bunker.
If you run out of time, become a hero.
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