Jet engine
Consumption of fuel or propellant

Engine type
Scenario
Spec. fuel cons.
Spec. fuel cons.
Specific impulse (s)
Effective exhaust velocity (m/s)
Engine type
Scenario
(lb/lbf·h)
(g/kN·s)
Specific impulse (s)
Effective exhaust velocity (m/s)
NK-33 rocket engine
Vacuum
10.9
308
331
3250
SSME rocket engine
Space shuttle vacuum
7.95
225
453
4440
Ramjet
Mach 1
4.5
130
800
7800
J-58 turbojet
SR-71 at Mach 3.2 (Wet)
1.9
54
1900
19000
Eurojet EJ200
Reheat
1.66–1.73
47–49
2080–2170
20400–21300
Rolls-Royce/Snecma Olympus 593 turbojet
Concorde Mach 2 cruise (Dry)
1.195
33.8
3010
29500
Eurojet EJ200
Dry
0.74–0.81
21–23
4400–4900
44000–48000
CF6-80C2B1F turbofan
Boeing 747-400 cruise
0.605
17.1
5950
58400
General Electric CF6 turbofan
Sea level
0.307
8.7
11700
115000

Question: What turbo fan uses less fuel than the Concorde's Rolls-Royce/Snecma Olympus 593 turbojet?
Answer: General Electric's CF6 turbofan, uses a lot less fuel than the, Concorde's Rolls-Royce/Snecma Olympus 593 turbojet.