Fantastic Job! You did great to resist the urge to drop the shape to the top of the tailgate. It is a common misconception that you want the back to be as small as possible, but in fact, you just need to follow the template which you've done wonderfully.
I'm sure the first thing you'll notice is that at highway speeds, your truck will feel much more stable, it'll seem like you put arrow fletches in place on the back of your truck. It will be quieter as well. Then you'll notice, hopefully, a 2 mpg gain in FE if you drive at 50 & better a lot. If yer just kickin around town, there may not be much gain.
Looking forward to hearing how it performs.
Again...Great Job!!!!
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