Brake-specific fuel consumption
kW hp Year Engine Type Application lb/ ( hp⋅h ) g/ ( kW⋅h ) efficiency
48 64 1989 Rotax 582 gasoline , 2-stroke Aviation , Ultralight , Eurofly Fire Fox 0.699 425 19.3%
321 431 1987 PW206B/B2 turboshaft Helicopter , EC135 0.553 336 24.4%
427 572 1987 PW207D turboshaft Helicopter , Bell 427 0.537 327 25.1%
500 670 1981 Arrius 2B1/2B1A-1 turboshaft Helicopter , EC135 0.526 320 25.6%
820 1,100 1960 PT6 C-67C turboshaft Helicopter , AW139 0.490 298 27.5%
958 1,285 1989 MTR390 turboshaft Helicopter , Tiger 0.460 280 29.3%
84.5 113.3 1996 Rotax 914 gasoline , turbo Aviation , Light-sport aircraft , WT9 Dynamic 0.454 276 29.7%
88 118 1942 Lycoming O-235-L gasoline Aviation , General aviation , Cessna 152 0.452 275 29.8%
1,799 2,412 1984 RTM322 -01/9 turboshaft Helicopter , NH90 0.420 255 32.1%
63 84 1991 GM Saturn I4 engine gasoline Cars , Saturn S-Series 0.411 250 32.5%
150 200 2011 Ford EcoBoost gasoline , turbo Cars , Ford 0.403 245 33.5%
300 400 1961 Lycoming IO-720 gasoline Aviation , General aviation , PAC Fletcher 0.4 243 34.2%
7,000 9,400 1986 Rolls-Royce MT7 gas turbine Hovercraft , SSC 0.3998 243.2 34.7%
2,000 2,700 1945 Wright R-3350 Duplex-Cyclone gasoline , turbo-compound Aviation , Commercial aviation ; B-29 , Constellation , DC-7 0.380 231 35.5%
57 76 2003 Toyota 1NZ-FXE gasoline Car , Toyota Prius 0.370 225 36.4%
550 740 1931 Junkers Jumo 204 diesel 2-stroke , turbo Aviation , Commercial aviation , Junkers Ju 86 0.347 211 40%
36,000 48,000 2002 Rolls-Royce Marine Trent turboshaft Marine propulsion 0.340 207 40.7%
2,340 3,140 1949 Napier Nomad Diesel-compound Concept Aircraft engine 0.340 207 40.7%
165 221 2000 Volkswagen 3.3 V8 TDI Diesel Car , Audi A8 0.337 205 41.1%
2,013 2,699 1940 Deutz DZ 710 Diesel two stroke Concept Aircraft engine 0.330 201 41.9%
Examples of values of BSFC for shaft engines
The following table takes values as an example for the specific fuel consumption of several types of engines . For specific engines values can and often do differ from the table values shown below . Energy efficiency is based on a lower heating value of 42.7 MJ/kg ( 84.3 g/ ( kW⋅h ) ) for diesel fuel and jet fuel , 43.9 MJ/kg ( 82 g/ ( kW⋅h ) ) for gasoline .
Brake-specific fuel consumption (BSFC) is a measure of the fuel efficiency of any prime mover that burns fuel and produces rotational, or shaft power. It is typically used for comparing the efficiency of internal combustion engines with a shaft output. It is the rate of fuel consumption divided by the power produced. It may also be thought of as power-specific fuel consumption, for this reason. BSFC allows the fuel efficiency of different engines to be directly compared.