What tolerances are acceptable?
If iI were the man that calculates this, iI would calculate the computer-error error range. Then human-error range. Then think of the worst-case (maximum error). Then multiply that error-fraction with the total amount of fuel. Then add that much fuel onto the existing fuel.
Errors would come from:
- Measurement (both human and devices)
- Calculations(both)
- Probability of fuel leak.
- Probability of sudden changes in atmosphere.
- probability of finding free funds (credits or money whatever it is)
Lets say worst case is %00.55%, iI'd put %00.55% more.
Lets assume all computers and all the silicon-germanium werewas stolen by aliens. What do we do without digital devices? We make it hand-calcuated. Lets assume this error is %4040%. Then we put an extra fuel tank to be sure.