Saving climb fuel
I've found that you can climb at speed faster than max rate climb speed (Vy) and save fuel. When you climb at faster speed, you will get a longer ground distance. So if you climb from the same starting point, to the same target point at higher altitude, a climb at lower speed will need to fly level after reaching target altitude to get to target point. When adding fuel used from both climb leg and cruise leg, the total fuel used can be higher than fuel used from the direct climb to target point at higher speed. Is this a common knowledge? Is it used in some useful applications?