Thanks Skyjob, that's quite helpful. Should be interesting to run the math even if you already gave out the answer haha
@ehwhatezedoing
Forget a runway overrun. That's taking it to the extreme. Depending on runway length, current conditions and aircraft weight, you would need to reduce flex to a lower degree to meet perform requirements plus the increase in fuel associated with the increase in power. Unless really light on weight (i.e. no reduction in flex for takeoff) I don't think it would save too much.
P.S. We aren't allowed to do intersection takeoffs at our gig