Four steps: fuel and quantity, where it goes, how you pay, and a review. The rail on the right holds the total the whole way through.
Pick a fuel, say how much, and the screen tells you before you commit whether it can actually be filled — how many vendors nearby hold it, the largest single order any of them can take, and the two refusals that are not the same thing: sold out, and stocked but unpriced today.
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