https://www.amazon.ca/gp/product/B07XDNTXYX/ref=ppx_yo_dt_b_asin_image_o03_s00?ie=UTF8&psc=1
I had these mudflaps installed. Wh/km jumped up dramatically from 160 to 200!!
I think you'd be the first to report any significant drop in efficiency for pretty much any mudflap.
AWD?, Tires?, Cold PSI?, MPH
If you are new to Model 3, this time of year wh/mi can start climbing pretty fast.
The only way to compare is with HVAC OFF. And ideally back to back conditions and a "loop".
I did a 30 mile loop, immediately before and after the install at 65mph and saw 0 difference in efficiency. You might see some at higher speeds.
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