For me I don't get the saving time. If I need to inject tomorrow.... And time is short in the am before work, I just inject the night before. So I'm 12, 18, or 20 hours ahead. I have also stated before our bodies ARE NOT DIGITAL. So many factors... Metabolism, when eating and digesting, heart rate, sitting, sleeping and on can have shuttle, effects to our absorption.
In the grand scheme of a 12 week cycle , more even I think and have experienced no cycle effect good or bad as to injecting a day late or a day early, am or pm.
I will qualify by stating what I said does not hold true when doing short esters like ED or EOD pins
OMM