NH requires a front license plate, and I called our DMV to see if the sticker/wrap would fly: absolutely not. I ended up with the front license plate, because depending on the day and somebody's mood, I could end up with a hassle or a ticket or both. It has had no impact on my enjoyment of driving the car.
The following is not meant to be mean (seriously), but it seems that using a fig leaf of the aerodynamics impact of a front license plate is kinda amusing. It would be interesting to see how many mention efficiency or "drag" of the plate, but get the 21" tires, remove the aero covers on the wheels, or have mastered the "launch mode" and may be the first off the blocks at a light. The only comments I have gotten about my front plate so far are that the car screams for a vanity plate.