Is the MDI a special diagnostic tool for use with the hybrids?

I don't see an improvement with the transmission recall update. While it may change the V8/V4 change point, it doesn't improve my overall mileage. But it is colder here. In Texas, it could be 82F/28C one minute and then 50F/10C and back again. I sometimes block the grill on the Prius but haven't considered it on the truck. I am definitely getting worse mileage however.