Mine vary..............I get DP which definitely makes it bump up by a couple of units when it decides to appear. Mine also go up with less exercise. A lot of people say it can vary when the weather changes.
I have 4 programs on my pump, which can tell you the variance I get!
My current one, I adjust that one whenever needed
DP one, has higher setting starting at 5 am, I only change to it if I've had several DP days in a row.
Snorkel day, I snorkel for about 2-3 hours and at about 4 hours later I need a lot less insulin for about 24 hours.
1 is just in case....with very low settings