I've been wondering just how much the extremely low goal of Cd=0.21 (drag coefficient) for M3 was going to make, especially when compared to, say, the Chevy Bolt. I found a great start on figuring it out here: Chevrolet Bolt EV Range at Constant Speeds I used this to calculate ranges at different Cd to see how much difference would it make since the Bolt has a terrible Cd of 0.31, particularly at speed. The result from my calculation is quite intriguing! The article mentioned above is geared mostly towards higher speed results, so the formula results are not that accurate at low speeds, but I was interested to know the effects of Cd, which really only come into play above say 35 mph. The formulas result in the Bolt getting 238mi at constant 65mph. If I ONLY change the Cd and put the M3 value of .21 the range at constant 65 mph goes to 306mi. So, while the Bolt may have lower resistance tires and a more efficient motor, the M3 should be able to cruise on the freeway with significantly reduced aerodrag. This is just to show the impact, not to say the same numbers will apply to the M3.