I disagree with your conclusion. FALSE and 1==0 produce exactly the same code, yet in one place the results say one is 119% times the speed of the other, and in another place the results say one is 715% times the speed of the other.

A better conclusion would be that the benchmark is useless. The reason might be that external factors (such as cache misses, context swapping) have a stronger influences on that the speed of those operations than the choice of operation.