Supreme Official Strategy Guide
Location
Required Items
Rewards
What the allowance actually buys
One allowance here buys 1,103,750 EXP, which places it 2nd of the 3 Lv 78 Alchemist tradecraft leves that record EXP. The best of them, A Labor of Love, returns 1,201,060 EXP for the same allowance, 9% more.
Across that rung the return runs from 720,630 EXP to 1,201,060 EXP per allowance — 3 distinct figures spanning 67%, so the wrong pick leaves 480,430 EXP of the allowance unspent.
On whether to wait: the best Lv 80 Alchemist tradecraft leve returns 1,355,750 EXP per allowance, 13% more than the best on this rung, while the Lv 76 rung behind tops out at 1,087,990 EXP.
At Lv 78 this data holds 27 leves paying EXP across 2 categories: the 24 Tradecraft ones average 955,432 EXP per allowance, the 3 Fieldcraft ones 2,129,178 EXP, which puts this leve 16% above its own category's average.
Gil ranks it differently: 4,838 gil per allowance is 1st of 3 on the same rung against 2nd on EXP, with the best there paying 4,838 gil.
Dwarven Mythril Codex ×1 is a Lv 78 Alchemist recipe, 2 steps deep through 4 intermediates, costing 24 units of raw material and 48 crystals.
Handing that in returns 45,990 EXP and 202 gil for every unit of raw material the order swallows, and the tree needs Alchemist, Blacksmith, Carpenter and Goldsmith.