[ramraj07]

Please unsimplify this then? Can you give a scenario where flying faster would be more economical fuel-wise?

[mdmglr]

This should enlighten you: https://aviation.stackexchange.com/questions/1609/why-do-jet...

[selectodude]

It’s not a linear relationship but unless you’re flying in space, you’re going to deal with the fuel vs speed trade off.

[TylerE]

If you fly too slow the wing will start to stall, so you have to pull the nose up to raise the angle of attack…. Which vastly increases drag.