I would be interested in knowing if the bio-oil has the same environmental profile as does oil. Meaning, does it become sluggish and chunky at low temperatures, thus is unable to travel via gravity to your furnance? I have heard of similar problems with bio-oils in other applications. No fun buying a couple of hundred gallons of fuel only to find out it must be heated to remain liquid. It would be really unfortunate for MA residents to wake up freezing with a full fuel tank on the side yard.
You know, I never even thought of that! OMG.
Yes, propane can be expensive. You just have to shop around and get the right supplier. I have had three different ones before I found one I liked and was reasonable. Natural gas is not an option for me nor would I want it (BOOM!).