it has 14v at idle, and I am yet to either try it under load with the lights on, or spend shit loads putting it on a dyno for 5 minutes and do the same thing....
I don't use the car everyday so it's one of the least of my worries at the moment, and I guess I am a bit lazy and just waiting to see what other people come up with, I'd also like to put some normal plugs back in and see what happens there, I have platinums in at the moment...