I think I've discoved the oil thief (besides kidlet taking long showers when no one is home to yell at him).
Today, I reset the programable thermostats even lower, with longer intervals with reduced heating (the bedroom/bathroom zone comes on at 4:45 Mon-Fri and 6 a.m. Sat-Sun @ 65 degrees, shuts down M-F @ 6:15 a.m. and on Sat/Sun @ 9 a.m. to 60. Back up to 65 @ 2:30 p.m. M-F, @ 6:30 p.m. Sat-Sun. Shuts down to 60 M-F @ 9, Sat-Sun @ 10). The main thermostat for kitchen/Living room follows the other schedule for the bedroom zone. The one remaining dial thermostat is located in the office, formerly the L shaped porch. I keep it at 60, turn it up to 65 if working in the office or using the dining room area of this L shaped porch.
I discovered that the office was warm today, and when checked, the thermostat registered as set to 60. I checked the registers, sure enough, they are warm. OK, I shut the thermostat OFF, this continues, with the temperature reading on the bottom of the thermostat registering at 68-no wonder it felt balmy! So this thermostat is busted. Sigh. Note that neither of the other thermostats or radiators were putting out heat so it's definately this one.
Plan is to go to a big box store tomorrow morning and buy the third programable thermostat I was considering (again, all 3 will be removed when I do move out, keeping my $75 investment). I have a work order in to Mr Handyman (sent on-line) for a laundry list of small jobs/tasks so it was approaching time to call them again anyway. I am off Monday, and have 1/2 days the rest of the week, due to exams. Hopefully, I can schedule something for this week, even if I can just initially get the thermostat replaced.