I'm an engineer, but not an exercise machine expert, but the numbers don't seem accurate to me. For instance, a friend has a high-end treadmill that she uses for walking. She's convinced she's covering only 2 miles in 60 minutes because that's what the readout sez.
I don't take any readout as gospel. When you consider the differences in bodies, how fit they are, and let's not forget calibration, well, I only use a readout as a relative comparison, i.e. I exercised at X level, expended Y more energy in Z time during this workout than last, whether Y is absoutely accurate doesn't matter.
As a general indication
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