As some of you know I recently (in the end of January) moved into a new house. This house has oil heat, a new thing for me. We had zero oil when we moved in, so we got 100 gallons - seemed like a lot to me...it lasted about 3 weeks. So, with lots of wishful thinking on our part, we got another 100 gallons, which was enough to bring us to today. I wouldn't have thought that I would need more oil....in MARCH...but at $400 per fill, I'm kinda fed up with it. I heard about putting deisil in the tank and running with it. And I'm hoping this never-ending frigid weather with end sometime this year.....my question is, have you ever done the deisil thing? Do you think it would be more economical to do it for a couple of weeks than filling the tank?