Well so soon...
I just opened my PECO bill and ugh...$196 (NG was $85, $60 elec, rest taxes, carrier/transportation fee...LOL...I pay for the pipes in the ground!)
I have same sqft as OP.
This for Dec->Jan.
Cold Dec but not coldest. I like how they compare it (in bill) to last years same time, and temps.
Then I realized, I took three weeks off (Xmas) and was home more than usual (day) and family/friends over (baking, heat, lights, ...). --