So in the real world, you’d plug the first few far destinations in the computer. If computer tells you to charge, you charge. If computer tells you arrive with 10-30%, you’d probably plan to charge for remainder of destinations. If computer says you land at 40-50%, you know you have sufficient buffer for additional runs.
The point is that all the components in the equation have uncertainty (exact route, traffic, weather, driving style, vehicle load, etc), so having a range readout with single-mile precision isnt that useful