I'm not sure if I am entitled to an opinion, after all i only fly a Cessna 150 :P But i understand than the les power you are producing at any given time, the less dinosaurs per second you are burning, right??? So it makes more sense to make a steep approach at idle rather that a shallow one at some power. And also (And this is where i am entering unknown terrain) When you spend more fuel is at low altitude, right? Because of denser air right? Then a quick descent makes also spend you less time on the high fuel consumption altitudes than a shallow one... So from a common sense point of view you should be right, right?
Steeper approach (gliding) = Less fuel consumed BUT you also have to take other stuff into consideration such as traffic sepparation and passenger comfort...
If i stuck my foot in my mouth, please, let me know
