fuel-as-factor-for-costs-and-environment1950 1960 1970 1980 1990 2000Turbine inlet temperature [°C]Normalized specific fuel consumption [°C]Total pressure ratioYear of serial implemenationTrends of the engine inlet temperature, the total pressure ratio, andfuel consumption as indicators of engine evolution?45503015000.500.7510.25Civil.Civil.Civil.700170014501200950Civil.CF6-50C1CF6-50C2CF6-80CCF6-6DCFM56-3RB211-524D4RB211-22BCJ805-23CJ805-3JT3CJT8D-209JT8D-15JT8D-9JT3DGE90JT9D-7R4PW2037"Rel. Cruise" SFC1.21.11.00.90.80.70.60.50.41950 1960 1970 1980 1990 2000 2010YearTurbofans with lowbypass ratiosTurbofans with highbypass ratiosTurbojetsHistorical trend of specific fuel consumption in civilian sub-sonic aircraftFuel consumption is a decisive factor for the costs and environmental impact of an engine.