56 just now. He is running on the low side now. I guess that's a good thing?! I recall when a cat has a hypo they subsequently become more sensitive to insulin, so numbers like these may actually be inoculating him to some degree against a relapse if there should be some future dietary indiscretion (either pet or owner induced). I keep my cat food locked away in a closet including some old high carb kibble he used to eat, to try & keep him from chewing/clawing the containers open. When I open the door, he races in there & immediately starts clawing at his old candy kibble bags. He's a sugar addicted kitty even still.
He's seemed ok. I just recall that when I was shooting numbers in the 400's (sometimes high 400's) on a sliding scale PZI and the next one I was checking was in the 40's, he seemed just fine at high 40's, whereas, low 40s, he started looking slightly symptomatic. In neither case did I hit the panic button; I just fed him. Maybe the rate of change has something to do with it also (a slight variant on what you're saying). In other words, if he lives in the 50's and 60's (seems to be the case now), he tolerates a 40, but if he's been 490, when he's 40 in 6 hours that's a bigger problem. Again, that's just my ignorant musing on the subect...
Thanks everyone.