Not scared of the truth. Energy is power over time, and power is a time averaged measurement. So you're using a time average of a time average to derive some core value. Perhaps you're underestimating the comparison. I said at a flow rate of 100kg/hr 1kg of diesel at 30% efficiency will produce somewhere in the realm of 700hp. Those 700hp cannot be provided by any battery for an hour straight, there are no batteries that can hold that kind of charge. Turbine engines, diesel engines/piston engines in general, can, as long as you have a big enough gas tank. I like my vroom vroom more than electric whirring.