As a commuter and a mostly rational human, I agree with Qotsaautopilot. Run the packs until the last 1/4 remain unless it's either under 50F with no sun (or most shades down) or under 40F with the sun coming in. I'm not with Spirit but doesn't your FOM say something about passenger comfort? One of your own is telling you your passengers are uncomfortable... Also it's just the right thing to do.