Turbines can even run on natural gas (peak electrical generation). It all has to do with how the combustor is designed along with the compressor delivering the air and the injectors delivering the fuel.. whatever it is. The efficiency and power you get out of the turbine also is optimized for the fuel its using, so running Avgas in a turbine designed for JetA might not have enough power to get you off the ground or burn too hot to damage the Stage One High Pressure Turbine Blades.