gap
Not to sound curt,but in the grand scheme of things,I don't think the gap is an issue.
Air,while not very dense,does possess inertia,and once it is directed down the roof an flanks of the truck,it's momentum will just tend to carry it,skipping over the discontinuity.
Sure there's a little penalty but maybe not worth the energy to go after.
Uni-body pickups,as VW's and Honda's don't possess remarkable mpg in spite of their complete absence of a gap.
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