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Here are a few ideas that may help anyone wanting to become more aerodynamic:
1. Tapering sides is as important as tapering top and bottom.
2. On a pickup, the bed is a restraint; it is hard to taper until past it.
3. Flex material between bed and cab will create a seal without damage.
4. Side skirts for higher vehicles is a must.
5. Don't forget the dimple effect. I have known for many years that making dimples or dents all over the body will increase economy. (Think golf ball.)
6. The front (grill/headlight/bumper area) needs tapering forward to cut the wind, but I doubt that there is much improvement versus cost benefit to trying to change a windshield angle. It is already angled more than the front end.
7. If there is plenty of weight and downforce at speed, then a lifting wing may decrease rolling resistance and increase mileage.
Hope that helps some.
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