Drag From Cold Weather

I've seen this a few times where people claim that cold weather will produce more drag on a vehicle just the cold dense air. So just for the fun of it I went and did the calculation on just the air drag part of it. Not factoring in other loses like fluid thickening...

Here is the formulas I used

Drag

http://www.thefintels.com/aer/dragcalc.htm

Air Density

http://www.denysschen.com/catalogue/density.aspx

Dodge Ram Specs including Drag Coefficient

http://www.pickuptrucks.com/html/ram_specs.html

So using local information and building a test bed on this.

Vehicle - 2nd Generation Dodge Ram 2500 truck

Test #1 Winter (Column C)

Stats

[*]+10*F Temperature

[*]90% Humidity

[*]2,800 ft Elevation

[*]45 MPH (Road conditions locally)

Test #2 Summer (Column B)

Stats

[*]+100*F Temperature

[*]10% Humidity

[*]2,800 ft Elevation

[*]65 MPH

Test #3 Comparing both using both summer and winter conditions. (Columns E & F)

Which this shows roughly 4.659 MPH difference between winter and summer condition will be nearly equal in drag.

Just for fun compare 55 and 65 MPH...