It's a pain having to fuel special items from 0 to max fuel (10,000,000). Combine that with the frequent lag spike, it takes ages.
Add an option to max fuel in one go.
Either:
Check if the person has the enough shard to fuel up to 10m, or
Check how much shard a person have and it will only fuel it up to said amount of shard
Fuel=(TotalShard/ShardsCostToFuel) x FuelPerShardCost
Eg:
..
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