Abstract: Systems, methods, and heaters for treating a subsurface formation are described herein. At least one method for producing transportation fuel is described herein. The method for producing transportation fuel may include providing formation fluid having a boiling range distribution between ?5° C. and 350° C. from a subsurface in situ heat treatment process to a subsurface treatment facility. A liquid stream may be separated from the formation fluid. The separated liquid stream may be hydrotreated and then distilled to produce a distilled stream having a boiling range distribution between 150° C. and 350° C. The distilled liquid stream may be combined with one or more additives to produce transportation fuel.

Abstract: A diesel fuel based on a blend of a diesel fuel derived from a Fischer-Tropsch process, and a mineral oil based diesel fuel having a sulfur content of less than 100 ppmw; and a method of operating a diesel engine, which method involves combusting such diesel fuel in the diesel engine.