4° is a c hair undah shorts weathah! I weah thin flannel shirts for jackets all wintah long.

 

It's -16 F, and VERY breezy here. (25-30 mph winds.....) There is ICE forming on the INSIDE of the walls upstairs. I suspect the walls aren't insulated well. (or, at all.....) All lathe and plaster too.... you can see the pattern in the ice.

 

 

I would think the downward force on the tires would be minimal - most tonneau covers (with maybe an exception for some of the really heavy hard top ones) don't weight that much. As for fuel mileage, SEMA conducted some wind tunnel testing and found that a tonneau covers can improve your fuel efficiency by up to 10%. Read it yourself - a link to that study can be found here:

http://www.hitchanything.com/tonneau-covers.html

 

I call BS on that, because if it were true then the auto manufacturers would be installing them on pickup trucks off the assembly line -- and Detroit does NOT put anything on a vehicle that isn't needed that can't bring a decent ROI. I know this because my dad was an automotive engineer for over 20 years.