The performance engine, like the gasoline engine, runs on ethanol, but it also requires water coolant and can only reach its maximum output when given the correct additives to its fuel supply - redstone, gunpowder, or blaze powder, each being more effective than the last. Fully supplied and maintained, these engines produce 256 Nm of torque at 1024 rad/s, a total of 262.144kW.
This engine can also be run without an additive. In this case, the performance engine will produce the same power output as a gasoline engine, just with double the rate of fuel usage.
(Values are at max)