For #2, I used 4.4% based on the video here. In addition, in 2012 Tesla released aero covers for the Model S and many people were reporting 5% or more range improvement which is another data point that shows the aero covers work. Btw, Tesla has a blog post here that mentions the effect of wheel size on range.

1. Rolling resistance, which is more or less a constant force at all speeds. i.e. approx. constant joules (watt-hour) per mile at all speeds. Rolling resistance depends on the tire design, and everything else equal, is higher for low-profile, high performance tires

2. Aerodynamic resistance, which as everything else aerodynamic, is correlated to the power of speed.

The aero covers clearly only impact aerodynamics. Therefore, whatever correction factor you use for the covers should be correlated to (speed ^ 2), vs. a constant 4.4%