Good work Bill, you are like some kind of crazy Sportivo detective! I know from my own G-Tech timed testing that I can (just) exceed -1.0G during braking, as long as I stay out of ABS. With full-ABS braking, G forces are only -0.8 to -0.9, so I suspect they tested the cars at full force, and as we know, the 'Rolla's ABS program is not the best. So the moral of my story is stay out of ABS if you want to brake hard!