I think the answer is that we are all different. This is the range I have been running in for over 30 years. I am not competent at driving in the low BG range so will not drive with a BG below 48, That has been my rule for decades. When I drop below 48 my driving reactions are slower. The self-testing I do is to drive to a street with a stop sign (conveniently located next to my corporate offices) at 20-30 mph and then attempt to stop exactly on the white line at the stop sign. When I drop below 48, I can’t do that and will overshoot the line by 2-8 feet. At that point I consider myself driving impaired. The farther below 48 that I am, the longer the overshoot. Works for me.
