Ours was 238 this last bill.. but our gas went down to 43... Together, we pay about 300 year round for our gas/electric. Our house is 1800sq ft., one level, brick. not too old, but we rent, so I have no idea for sure.
We run the air at 74 day, 70 night. We also have 2 boys that don't know lights turn off too, and air filters that run constantly in the cat room. I do anywhere between 10-14 loads of laundry a week, and I've seen the meter almost fly off when the dryer is on!
My tank is a 90, running a HOB skimmer, Mag 350 filter, Koralia 3 powerhead, and 2 250 watt MHs that run 8 hours a day.
I am scared to see this next month though- we went out of town for a couple days and left the oven on 400
and this weekend, we left a window open, and the air at 70... UGH!!