Roof Box Fuel Economy
I drive a '16 Trailhawk with the V6, tech package, towing package, etc. Have not done any mods with the exception of aftermarket headlights. I am going on a road trip this summer and am wondering what kind of fuel economy I could expect to get with a thule enclosed roof box on. I will be driving interstate the whole time (80 mph) and the car will be loaded up with driver plus three people and a bunch of camping gear (maybe 1000lbs total of gear and passengers). Does anybody have experience with doing something like this and want to share their fuel economy figures?
Also, I may be putting on one of those trailer hitch cargo platforms on the back for more storage space. Anybody have any experience with those and how they effect ride quality/fuel economy/noise/etc?
Any feedback would be amazing! Thanks!