A General Electric J-79 engine consumes fuel at a rate of approximately 35-40 gallons per minute at full dry power and 85-90 gallons per minute with afterburner, according to a aviation blog post. This translates to roughly 2,100 to 2,400 gallons per hour at dry power and 5,100 to 5,400 gallons per hour with afterburner.
The F4 has two so plan on 4400 gallons per hour just flying around and when you want to really impress your friends and destroy every window in the area, crank up the afterburners, get her above the speed of sound and enjoy a fuel usage of roughly 10,400 gallons per hour. However, not to worry, She ain’t got big enough tanks to fly for a full hour at full tilt.
Fuel is running between $5 and $8 a gallon so for every hour, you’ll only be out between $22,000 and $35,000 depending on the daily fuel cost.
Might want to check out the going rate for a Cessna 150, might save a bit though it is just a tad slower.