GE's combined cycle turbines can get system level efficiency of around 63% from these sorts of temperatures.
(For those not familiar with them: They're basically aircraft jet engines followed by steam turbines using the hot exhaust. They are in widespread use to generate electricity from gas, but they can also run off any other liquid fuel, or simply off anything that gets very hot.)
GE's combined cycle turbines can get system level efficiency of around 63% from these sorts of temperatures.
(For those not familiar with them: They're basically aircraft jet engines followed by steam turbines using the hot exhaust. They are in widespread use to generate electricity from gas, but they can also run off any other liquid fuel, or simply off anything that gets very hot.)