depending on the type of induction, specific fuels are required.... for example, my truck runs 87 octane and my turbo mustang runs 93 unleaded or C16 race gas depending on the tune..if i was to run 87 octane with boost i would detonate and pop a head gasket or worse... higher octane fuels dont burn as hot and control detonation.. so, while higher octane fuels arent as volitile, they offer a larger window for more agressive timing, fuel mapping and forced induction level IN A PROPERLY CONFIGURED ENGINE... THE SAME CAN BE SAID IN A NATURALLY ASPIRATED ENGINE WITH A SPECIFIC FUEL
.....in other words.. all fuels have the potential to make more power over the other... it all depends on if the motor is setup for the specific fuel or not...it doesnt specifically correlate with octane content or BTU's... most fuels at the gas pump are close to 114,000 BTU's... this does not include diesel or Ethanol..