Yeah, about a pound a day, maybe a bit more, maybe a bit less. Only place it gets tricky is MTR to Whitney. The first half of the trail you can buy a cheeseburger every other day (Yosemite, Tuolumne Meadows, Reds Meadow, VVR, MTR), so between each of these all you need to do is carry a day and a half of food. I posted pictures and a list of what I eat earlier in the thread.
The summerlite is actually warmer than the bag I used the last two times . . . a highlite, and that was middle of september. I use a bivy so that adds some warmth, and if it's cold I wear some of my clothing . . . I've always been comfortable.