It came across as a sales pitch that they misrepresented as science.

At the pressures you're going to see, an Eaton (somewhat better than GMC, worse than Autorotor) may reach 70% efficiency: the gauge shows 10 psi, but the actual change mass is not (10 + 14.7) ÷ 14.7 = +68%, but ((10 × .70) + 14.7) ÷ 14.7 = +48%. Then subtract blower drive loss...

Boffin Emeritus