I often read that turbine engines can run on almost any fuel source. I understand that turbine engines are less "picky" in terms of the fuel source that they can use, but surely there would still be some limitations as to which fuel source can be used e.g. a certain range for flash point, auto-ignition temperature etc.?
Likewise, could a turbine engine be built from scratch to run on a fuel not normally suitable for turbine engines? And if so, would this engine be less efficient?