Mazda OEM moonroof deflector question

[bmninada]

I have a moonroof deflector make: Mazda. Wondering if this has any negative impact to mileage?

 

[MikeM.]

I have a moonroof deflector make: Mazda. Wondering if this has any negative impact to mileage?

The impact to mileage would be very small, less than 0.1 mpg. Driving everywhere with the moon roof open would cause a bigger hit.