File That under Whatever
Location
Required Items
Rewards
What the allowance actually buys
One allowance here buys 47,700 EXP, which places it 5th of the 6 Lv 40 Blacksmith tradecraft leves that record EXP — a figure 1 other leve on the rung matches exactly. The best of them, A Weighty Question, returns 79,510 EXP for the same allowance, 67% more.
On whether to wait: the best Lv 45 Blacksmith tradecraft leve returns 137,400 EXP per allowance, 73% more than the best on this rung, while the Lv 35 rung behind tops out at 72,600 EXP.
At Lv 40 this data holds 52 leves paying EXP across 2 categories: the 48 Tradecraft ones average 72,545 EXP per allowance, the 4 Fieldcraft ones 560,212 EXP, which puts this leve 34% below its own category's average.
Gil ranks it differently: 263 gil per allowance is 6th of 6 on the same rung against 5th on EXP, with the best there paying 574 gil.
Mythril File ×1 is a Lv 40 Blacksmith recipe, 2 steps deep through 2 intermediates, costing 8 units of raw material and 21 crystals.
Handing that in returns 5,963 EXP and 33 gil for every unit of raw material the order swallows, and the tree needs Blacksmith and Leatherworker.
The record carries a repeats value of 2. This site reads that as 2 further turn-ins on the same leve — an assumption, because the source data defines no meaning for the field — which would put the ceiling at 143,100 EXP and 789 gil for the 1 allowance it costs, or 143,100 EXP per allowance.