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Afterburner – A device in the back of high-performance jet engines that injects fuel into the hot exhaust. The resulting explosive burn greatly increases the thrust the engine creates, but uses very large amounts of fuel. Even modern fighters like the F-15 and F-16 can only carry enough fuel to go at maximum afterburner for a few minutes. The T-38 can only fly at full afterburner for about a minute, so discipline and fuel usage awareness are paramount to the military pilot.
Duh... More energy out = more energy in....