Just a note for all those using the 640G - the 670G is a very different beast, and the target glucose is related to the artificial pancreas functionality, so while the target glucose can be adjusted on the 640G,
it can't on the 670G.
@bambee3
When "Automode" is enabled, the system targets a sensor glucose level of 6.6mmol/l and adjusts insulin to try and achieve this.
This cannot be changed, mainly because the only tests that Medtronic did for approval used a target of 6.6mmol/l, which is consistent with an Hba1C of 6.5%.
@dancer - the result of this is that it aims to keep you at 6.6 precisely, which, even if you are Hypo unaware, is not going to cause too many issues as the dosing algo is very conservative.