Freeway at 65 MPH -24.5
Freeway at 65 MPH with aircon -23.2
Not sticking to the steering wheel and the rest of my black interior in the heat of summer - priceless
Before I hit the submit button, I just realized that priceless actually equals .148 gallons of fuel per hour, which at $3.00/gallon, is roughly 44 cents per hour. While not free, it beats feeling all slimy from driving in the heat without aircon.