fourfa -
Just for the record, aerohead is leading you in the right direction here. I am enthusiastic because I have thought about the "gap issue" in the past. In MPG races you will see drivers cover every possible gap in blue painter's tape because it is light and they are eager to "close the gap" between them and the best possible MPG they can get.
Quote:
Originally Posted by aerohead
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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CarloSW2