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Then there's another case:
I was talking to a fellow last week who keeps an ex-Chinese primary
trainer. He's had it for fifteen years. It will go 180 mph compared to
the modest 100 mph my old Cessna will do. Rugged and reliable (pneumatic
everything!)
But it costs 18 gallons of mogas per hour, compared to my 5.5 gals/hr.
I might easily have picked these numbers out of the air to illustrate
the square law of energy versus speed in airplanes - but I didn't. More
speed really does cost disproportionately