At some point, doesn't the additional time on the airframe eat some of the fuel savings?
MT
That's true for engines with an MSP type program like on the TFE 731s. But on Gulfstreams, at least the old Twos and Threes, they're on calender programs so there's no per hour charge.
We have found that flying LRC (.26 AOA) is the most economical under all circumstances--head winds or tailwinds. We might put more time on the airframe and engines by flying slower, but that will end up paying the owner a little more and giving the oil companies a little less. As I said, this equation changes when you're on an MSP program.