I never have issue of my vehicle because the accuracy of indication how far I can travel with my fuel. My car can travel 550 km and I always refuel when the car told me I can only run 30 km which is about 5% of my fuel. I trust DJI like my car. I plan to return home at 20% which is about 4.44 minute fly time but it chose to auto land.
Right but those calculations change when you go up and down a hill correct? This would be the same if you encounter wind. If your car is new enough it would say how much distance you have left before an empty tank right? Going up a hill will change that number for example.