Running out of fuel seems like less of a safety concern with this. Since it can land vertically, there are way more sites where it can make an emergency landing if the range estimate turns out to have been too optimistic.
Also, with a computer flying, you can do something less extreme: actively and continuously manage the compromise between speed and efficiency. If your confidence of reaching your destination drops below the required threshold (say 99.999%), slow to whatever speed is required to achieve that confidence.
Also, with a computer flying, you can do something less extreme: actively and continuously manage the compromise between speed and efficiency. If your confidence of reaching your destination drops below the required threshold (say 99.999%), slow to whatever speed is required to achieve that confidence.