The fighter was only in use by the USAF but the Aircraft had lots of problems. Only the last version the F-111F had the specifications which were planned in the beginning. There were build 563 Aircraft in different versions. The last version was build in 1975: the EF-111A Raven which was a electrical warfare platform.
The F-111 is still in service with the Australian Air Force.

Specifications

General
Design organisation	General Dynamics
Main secundary design organisations	Pratt & Whitney
Production organisaton	General Dynamics
Primary task	Interdiction and counterair
Type aircraft	Fighter jet
Specials	Variable-geometry wings
Length	73 ft 6 in
Height	17 ft
Wingspan	63 ft extended, 32 ft swept
Wing surface	525 square ft (48.77 m2)
Aspect ratio
Sweep back
Dihedral
Performance
Engines	2x TF30-P-3 (F-111A) with afterburner 2x TF30-P-9 (F-111D) with afterburner 2x TF30-P-7 (F-111G) with afterburner 2x TF30-P-100 (F-111F) with afterburner
Thrust	18,500 lb (TF30-P-3) 20,842 lb (TF30-P-9) 20,350 lb (TF30-P-7) 25,100 lb (TF30-P-100
Weight (empty)	47,481 lb
Weight (start, maximum, MTOW)	92,657 lb
Weight (landing, maximum, MLW)
Required runway length (start)
Required runway length (landing)
Cruise speed	685 mph
Maximum speed	1452 mph
Ceiling	57,000 ft
Maximum range	3632 miles
Fuel capacity
Air-to-air-refueling capability	Yes
Passengers	none
Payload	none
Equipment
Armament	Possible combination of: - 1x 20mm M61A1 gun
Maximum weapon load
Maximum G resistance
Radar
Sensors
Avionics
Type flight controls
Landing gear
Usage
Versions	F-111A, FB-111A, F-111B, F-111C, F-111D, , F-111F, F-111G, F-111G EF-111A,
Manufactured	563
Crew	2
Costs
Overall flight hours
First flight	December 1964
First delivery	1967 (USA) 1973 (Australia)
Operational since
Successor of
Replaced by	United States (1998): F-15E, EA-18G Australia (2010): F/A-18 Super Hornet
Comparable aircraft	Tornado
Operators (current and future)	Australia, United States
Main operators	United States Air Force
Amphibious usage	No, the Navy's F-111B version was cancelled
Status	out of production, out of operational service

US Air Force	Australia	Australia

References

1. Australian Air Force Museum
2. U.S. Air Force Museum