I'm pretty sure there's an issue in the first equation. A Nm (Newton-meter) is the cross-product between a force and a distance and is a vector quantity (more specifically a bivector), while a watt is a dot product and is a scalar quantity. Converting Nm to W is a dimensional analysis error.
Similarly mileage is force along the direction of travel, but that's moreso a nitpick.
Comments
I'm pretty sure there's an issue in the first equation. A Nm (Newton-meter) is the cross-product between a force and a distance and is a vector quantity (more specifically a bivector), while a watt is a dot product and is a scalar quantity. Converting Nm to W is a dimensional analysis error.
Similarly mileage is force along the direction of travel, but that's moreso a nitpick.
I'm not very good at dinensional analysis, but both 'units' and Wolfram Alpha agree that Nm and Wh are interchangeable.