PROBLEM TO BE SOLVED: To provide a fuel-specific economic efficiency calculation program, a fuel-specific economic efficiency calculation device, and a fuel-specific economic efficiency calculation method, which can properly comparing economic efficiency between a plurality of sorts of fuel.;SOLUTION: In the fuel-specific economic efficiency calculation program, a computer executes: a fuel economy recording procedure recording, in a recording device, fuel economy of fuel in a fuel tank for a period from oil supply of last time to oil supply of this time, each time oil is supplied to the fuel tank of equipment which can use a plurality of sorts of fuel; a blend ratio recording procedure calculating a blend ratio of the plurality of sorts of fuel in the fuel tank after the fuel supply each time the oil is supplied, and recording it in a storage device; a relational expression deriving procedure deriving a relational expression between the fuel economy and the blend ratio, based on histories of fuel economy and the blend ratio recorded in the memory device; a procedure for calculating a fuel economy by fuel, calculating fuel economy for each of the plurality of sorts of fuel; and an economic efficiency index calculation procedure calculating an index indicating the economic efficiency for each fuel based on the fuel economy for each fuel and a unit cost for each fuel.;COPYRIGHT: (C)2008,JPO&INPIT
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