i use just under a full 3 tons and about 1-2 tanks of oil (275 gallon tank) even though they come in 100-gallon spurts every couple months for auto-fill (my hot water heater is on the furnace, boiler, so it still runs, and my stove is on my main level of the split-level house, so the lower story gets no heat.... and thats my tv room. So, i do still run that room up a bit when i'm in it, otherwise, its kept at 55.
I did all the math once based on my first year of living here before i put the pellet stove in.
so long as heating oil is above $2.23 a gallon, it is cheaper to burn pellets.
That didn't factor in the cost of the stove, which over time will pay for itself. Frankly, i'm probably even already or will be soon this season.
It uses about $10 in a power a month run 24/7.
oil is currently 2.70 around here, and seems to keep going up, so i'm making 'profit' by over 50 cents.
Now, with the oil, it was rarely over 62 in my house so i was being very cheap. This is back when oil was 4.50-$5 a gallon
With the stove, it stays upper 60s to low 70s.
So, i'm saving money, having a warmer home, buring a 'carbon neutral' product (pellets are all waste product) and best of all, i'm supporting American/Canadian wood workers/flooring makers/cabinet makers instead of terrorist arabs and the black blood that sucks our politicians to shit.