Dear diab folks,
I inject 100% basal, as in my fastest insulin takes 2 hours to start and lasts over 8 hours and the slow insulin takes 6 hours to start and lasts 22 hours and I mix the two together and inject both every 12 hours, so have 4 curves superimposed on each other which may sound complicated but is easy for me after so many decades, it's second nature. I have been type 1 for 52 years this next summer and still have no complications.
My subject is about injecting. Injecting produces a bubble under the skin that absorbs into the body through the surface area of the bubble. By injecting 1/2 of the dosage in 2 different areas increases the surface area, through the two surface areas of both bubbles by about 40% so absorbs much faster. If you find yourself very high BG and you want to knock it down fast then inject your calculated dose 1/2 into different sites the absorption will happen 40% faster. Of course test this out on yourself during a less than critical situation to see how you react to it.
I do not use DMI practices so always have to eat at specific times. If I have a dinner date with someone I take my morning shot in two places and am therefore ready and hungry for lunch instead of supper.
Just a tip for those who like to try new things.