[gregersonke]

It's pretty simple, just get flashing from Home Depot. Extend it out, and then fold it in half. Make your zigzags at close to 60 degree angle as you can. Then break it apart and you'll have two pieces of evenly matched zig-zag tape. I find it works very well under the lip of the front bumper for about a 5 percent gain. I'm still looking for a zig-zag punch like the ones they use in scrapbooking to speed up the process. But so far this method will get you zig-zag tape for your front bumper in less than an hours work. Just be delicate when you go to install it. I try to get it as much into the primary air flow as possible without being seen. Even on an 08 sienna we saw average fuel mileage increase by nearly 1mpg from 20.4 to 21.2 over the course of a tank.