So your proposition that free will is an illusion is untestable? There is no measurable evidence that it is so?
I'm not sure why that's relevant. There have been experiments done that show decisions being made before the person is conscious of it, so there is supporting evidence.
I'm using an irrefutable logical argument, though. The empirical evidence exists, but it's superfluous. The logic gets you there on its own.
And you still haven't given me an example of a choice you could make that would suggest you have free will.