Ultimate Official Strategy Guide
Location
Required Items
Rewards
What the allowance actually buys
One allowance here buys 681,530 EXP, the best of the 3 Lv 68 Alchemist tradecraft leves that record EXP: the runner-up manages 491,260 EXP, 28% less.
Across that rung the return runs from 219,640 EXP to 681,530 EXP per allowance — 3 distinct figures spanning 210%, so the wrong pick leaves 461,890 EXP of the allowance unspent.
On whether to wait: the best Lv 70 Alchemist tradecraft leve returns 693,190 EXP per allowance, 2% more than the best on this rung, while the Lv 66 rung behind tops out at 625,040 EXP.
At Lv 68 this data holds 27 leves paying EXP across 2 categories: the 24 Tradecraft ones average 550,185 EXP per allowance, the 3 Fieldcraft ones 1,189,544 EXP, which puts this leve 24% above its own category's average.
Gazelleskin Codex ×1 is a Lv 68 Alchemist recipe, 3 steps deep through 5 intermediates, costing 26 units of raw material and 39 crystals.
Handing that in returns 26,213 EXP and 134 gil for every unit of raw material the order swallows, and the tree needs Alchemist, Carpenter, Goldsmith and Leatherworker.