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The highly paraffinic related fuel properties such as high H:C ratio, high cetane number, and low density together with the virtually zero-sulfur and very low aromatics content of low-temperature Fischer-Tropsch (LTFT) derived synthetic diesel contribute to its clean combustion performance. The low density and low aromatic content however results in LTFT diesel having a lower volumetric heating value than conventional diesel and elastomer compatibility concerns where the diesel is to be used in a mixed fuel scenario. Blending LTFT diesel with another synthetic derived fuel with similar, good fuel properties, but which contains monoaromatics, such as the coal derived high-temperature Fischer-Tropsch (HTFT) diesel, could unlock potential performance synergies in the fuel properties of such blends. The Fischer-Tropsch (FT) diesel blends have an ultralow sulfur content, high cetane number, and good cold flow properties and are stable under specified storage and oxidizing conditions. With the presence of about 25% mono-aromatics in HTFT diesel, the shrinking nature of swollen elastomer seals typically found in diesel fuel injection systems is less when exposed to the FT blend than when exposed to neat LTFT diesel. The HTFT diesel improves the volumetric heating value and fuel economy of the LTFT diesel in such an FT blend with comparable particular matter and hydrocarbon exhaust emissions. Although the blend with HTFT diesel increases the volumetric heating value, it decreases the specific heating value (mass basis). These alternative diesel fuel blends therefore provide future fuel characteristics that are compatible with current infrastructure and technology.

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