Kerosene is more expensive than fuel oil and is used in situations where the tank is exposed to cold temperatures. Fuel oil gels at colder temperatures. Pound for pound kerosene has less energy than No. 2 Fuel oil and is generally more expensive. Because it has less energy you have to use more of it to get the same amount of heat, although the amount isn't that great. 139,000 btu's for #2 fuel oil 135,000 for kerosene.
As far as "burning cleaner", I don't know if that is true or not but regardless an oil burner needs to be cleaned annually (change filters and nozzle) and adjusted to minimize soot which makes the boiler or furnace less efficient. Bottom line, I would burn the cheapest fuel if gelling isn't a problem.
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