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Residual Fuel Oil (RFO) is a low grade of fuel oil which
contains the undistilled residue from atmospheric or vacuum
distillation of crude oil and may be called Bunker Fuel Oil, No. 6
Fuel Oil, or heavy Fuel Oil.
It is higher in viscosity than a distillate fuel, so it normally
requires preheating for pumping and atomization.The major advantage
of residual fuel is that it is the cheapest liquid fuel available,
in large part because it is a byproduct of the refining of gasoline
and diesel fuel. As such, it sells for less per gallon than crude
oil, the raw material from which it is made.
Since heavy fuel prices are usually *0 percent to *5 percent of the
price of crude, refiners try to minimize production of heavy fuel
oil and maximize the production of higher-value gasoline and
distillate fuels.
