Sorry......
.8 = 800 lbs of fuel = approx 120 gallons which does not get you far in any fighter
.4 = 24 minutes of flight time
Fat fingered means he added a bit of time to the actual "real" flight time to make the number a little larger. The two hours of hassle of planning, briefing, getting dressed and manning up for that short a flight made many of us add a tenth or two to a flight for the effort.
An additional point is the jet was towed to the end of the runway to save fuel used in normal start-up and taxi.
Pugs