A gas oven is not 100% efficient. If yours says it is, it's a lie sold to you by gas oven manufacturers. It's 100% efficient compared to some previous oven sold.
Simple proof by example; if the exhaust air of your gas oven is warmer than ambient energy, it cannot be 100% efficient. (A few other laws of thermodynamics also play in here)
A gas turbine has the advantage that it can use higher temperature gradients within, as well as high speeds and other mechanisms to take advantage of larger burnoffs of gas.
A gas turbine is 60% efficient at base load and largely will be able to maintain 60% efficiency while being maintained at this load. A gas oven has a rough efficiency of around 70-90 % in AFUE. AFUE does not measure actual thermal efficiency, you can usually subtract between 10-35% depending on your boiler system, which ends you between... 40-60% just like a gas turbine in a worst case. The better cases of 60-80% are unlikely to be a steady state efficiency and more likely to be achieved if you have a boiler with great heat capacity that can hold onto the heat for longer. The efficiency here is ruined by ignition each time the furnace has to start running.
Turns out you can't cheat thermodynamics, but you can certainly market like you did.
Simple proof by example; if the exhaust air of your gas oven is warmer than ambient energy, it cannot be 100% efficient. (A few other laws of thermodynamics also play in here)
A gas turbine has the advantage that it can use higher temperature gradients within, as well as high speeds and other mechanisms to take advantage of larger burnoffs of gas.
A gas turbine is 60% efficient at base load and largely will be able to maintain 60% efficiency while being maintained at this load. A gas oven has a rough efficiency of around 70-90 % in AFUE. AFUE does not measure actual thermal efficiency, you can usually subtract between 10-35% depending on your boiler system, which ends you between... 40-60% just like a gas turbine in a worst case. The better cases of 60-80% are unlikely to be a steady state efficiency and more likely to be achieved if you have a boiler with great heat capacity that can hold onto the heat for longer. The efficiency here is ruined by ignition each time the furnace has to start running.
Turns out you can't cheat thermodynamics, but you can certainly market like you did.