I think people generally want honest hp numbers, but the efficiency of a drivetrain isn't known untill they test it as well. There is no point in detuning the engine as well- especially on a flag ship vehicle (actually i hope when they dyno the zr-1 it gets like 620whp

. This is highly unlikely but what if a company somehow achieved a drivetrain loss of less than 10%? It could be possible with DCT tranmissions, maybe the new design provides an overall better transfer of power?