Regarding fuel prices and usage.
Since price is set by only supply and demand, I believe there are some tweaks that could help stabilize the price.
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I dont know if its already planned, forgive me if it is repetitive, but the possibility of land owners to use their own fuel, produced in their land, for overworld playing without selling and buying in illuvidex would be a great refinement.
From a psychological factor, it feels like "free" to play stage 2-3 using my own fuel.
Besides, when fuel prices are low, it would incentivize playing instead of more undercutting prices or hoarding (until the point where we need to dump to market at whatever price because we have a full storage) -
Adding that to a price fixation around a certain price, with 25% or so variation up or down would also make things more predictable. Cheaper fuel leads to cheaper illuvialls, consumption, fees, etc. Nothing good comes from it. I believe it was planned to be that way, dont know why is not now.