Diesel fuels find use in the fleet of trucks which transport the nations goods . They are therefore more efficient . It is also interesting to note that diesel engines have no spark plugs , instead the fuel-air mixture is ignited by the rising temperatures and pressures during the compression stroke . In the winter refineries produce more gas oil , whereas during the summer driving months they produce more gasoline . Heavy Fuel Oil is often blended with gas oils for easier use in industry.
Ships burn heavy fuel oils but they call it bunker oil .
Atmospheric Residual is everything that cannot be vaporized under normal pressures . Atmospheric residual is fed into another distillation column, operating at lower pressures, which can separate out some of the lighter compounds. Lubricants and waxes reside in this fraction. Vacuum Residual is the bottom of the barrel . It includes asphalt and some coke .