4. Kerosene is used as a Fuel Oil blending component because its price/value is always lower than the market price of Fuel Oil fuel oil is sold in volume and adding kerosene gives a "volumetric advantage" kerosene is the most economically effective cutter stock for getting Fuel Oil viscosity on specification. all kerosene in a Refinery is used to make JET A1 which price is much higher than Fuel Oil. 5. Gasoline always try to blends nC4 up to the maximum allowed RVP because nC4 selling prices are always cheaper than any Gasoline blended product. nC4 are heavier molecules than gasoline blends the blending value of nC4 in gasoline is almost always higher than its sales price. gasoline is the only profitable destination of nC4s