So I'm sure most of us have at least heard of or know about the vortex bubble that forms in the bed of trucks when you're driving. This bubble is supposed to provide a certain degree of aerodynamics when it comes to drag. My question is if adding a toolbox there interrupts that bubble and has a substantial (or noticeable) impact on gas mileage.
I'm considering a toolbox but this is one of my major concerns as I'm the type of person that will squeeze all I can out of gas mileage. I'm also concerned with the loss of bed space as well for furniture and stuff of the like.