I caulked all of the open seams on the front and sides of the car. Then after the caulk had dried, I took a razor blade and cut a line through the caulk beads that went around things that I need to open (doors, hood, gas tank lid). All of these little bits of drag reduction add up to a noticeable result. With all of these aerodynamic improvements that I have made on my car, I'm seeing a great improvement in coasting ability and this current tank's MPG looks to be a significant improvement over any of my earlier ones. I have 231 miles on the trip odometer with still over 3/4 of a tank.
I live in a bamboo jungle.