Efficiency

For plane, Efficiency panel is a 3 in 1 panel.

If throttle is higher than 2%

It shows your planes actual efficiency. It indicates how many mah is needed to fly one km or mile.

If Throttle is below 2% and your plane is descending

It indicates the distance you can glide from your actual hight with your actual heading.

If Throttle is below 2% and your plane is climbing

It shows an up arrow indicating that you are probably in a thermic.

##For copter, Efficiency panel shows estimated remaining flight time