Mechanically, I agree.
I'll also curse the emptiness of internet communication - I bet this would be easier if we were all in the same room; I probably took too much the wrong way too fast - so my apologies there.
All I was really trying to get at was the point that maybe for Icarus, the cost-benefit analysis was that the extra time with his daughter was worth more than the money he could have saved by slowing down. So the overall trip sweet spot was found at a higher travel speed than what the mileage sweet spot is/was at.
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