What is the benefit to adding kerosene to home heating oil?

if you have a basement you can employ a gravity fed day tank with outdoor oil tank or an indoor storage tank.

oil pumps typically have a relief valve that sends oil not needed by the orifice back to the storage tank.

in many climates this is sufficient to keep the oil warm enough to flow

kerosine added to oil will make the oil flow on colder days

kerosine is more expensive than any heating oil

an indoor oil storage tank or a smaller indoor reserve tank (day tank) is more common in the colder climates.

so the benefit is a short term patch or crutch or bandage to a heating system improperly designed for the climate.

coal is cheaper than oil and harder to pump but is often used in the coldest climates

(energy density * fuel cost) + cost of fuel handling equipment = energy cost

over long term fuel handling is lowest factor

sawmills are powered by sawdust