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Why do forklifts use propane as fuel as oppose to another fuel?

At work, we have multiple forklifts that use propane as the fuel. They run out of fuel quite often and I have only heard of propane being used for cooking. What properties make it ideal for forklifts? Does is burn differently that other fuels?

Thank you.
gpt
Most forklifts are dual fuel(gas or propane) others are diesel & others electric/battery powered, as well.
Using propane allows for the machine to go indoors, and with the low Emissions of gas will not cause people to get sick or carbon monoxide poisoning when using indoors.