[aerohead]

In the spirit of not messing up your beautiful new car,you might experiment with cardboard mockups attached with 3M blue painter's tape.
With the instant MPG display,you'd know pretty quick what was working.
Mythbusters got their Dodge from 32,to 44.5 mpg while drafting a truck at 2-feet distance,equivalent to a 78% drag reduction,so it suggests that a MOPAR does react favorably to streamlining.